This one is quite troubling and I refer you to these sources:
From A Puritan's Mind
From Answering Islam
What I want to do is put the appropriate verses in chronological order and add a little commentary at the more difficult points:
A) The women at the tomb
Now after the Sabbath, as it began to dawn toward the first day of the week, Mary Magdalene and the other Mary came to look at the grave.
1When the Sabbath was over, Mary Magdalene, and Mary the mother of James, and Salome, bought spices, so that they might come and anoint Him. 2Very early on the first day of the week, they came to the tomb when the sun had risen.
But on the first day of the week, at early dawn, they came to the tomb bringing the spices which they had prepared.
Now on the first day of the week Mary Magdalene came early to the tomb, while it was still dark, and saw the stone already taken away from the tomb.
B) One of the two angels rolls away the stone and causes the guards to flee
2And behold, a severe earthquake had occurred, for an angel of the Lord descended from heaven and came and rolled away the stone and sat upon it.
3And his appearance was like lightning, and his clothing as white as snow.
4The guards shook for fear of him and became like dead men.
C) The women wonder how to open the tomb
3They were saying to one another, "Who will roll away the stone for us from the entrance of the tomb?"
4Looking up, they saw that the stone had been rolled away, although it was extremely large.
D) Mary Magdalene flees by herself to Peter and John
2So she ran and came to Simon Peter and to the other disciple whom Jesus loved, and said to them, "They have taken away the Lord out of the tomb, and we do not know where they have laid Him."
E) The other women who remain at the grave enter the tomb and see the 2 angels. The Matthean and Markan accounts focus only on one of the angels, while Luke decides to include both (so does John later on when they meet Mary Magdalene).
5Entering the tomb, they saw a young man sitting at the right, wearing a white robe; and they were amazed. 6And he said to them, "Do not be amazed; you are looking for Jesus the Nazarene, who has been crucified He has risen; He is not here; behold, here is the place where they laid Him. 7"But go, tell His disciples and Peter, 'He is going ahead of you to Galilee; there you will see Him, just as He told you.'"
5The angel said to the women, "Do not be afraid; for I know that you are looking for Jesus who has been crucified. 6"He is not here, for He has risen, just as He said. Come, see the place where He was lying. 7"Go quickly and tell His disciples that He has risen from the dead; and behold, He is going ahead of you into Galilee, there you will see Him; behold, I have told you."
4While they were perplexed about this, behold, two men suddenly stood near them in dazzling clothing;
5and as the women were terrified and bowed their faces to the ground, the men said to them, "Why do you seek the living One among the dead? 6"He is not here, but He has risen Remember how He spoke to you while He was still in Galilee, 7saying that the Son of Man must be delivered into the hands of sinful men, and be crucified, and the third day rise again."
F) The women leave the tomb, but are afraid to tell anyoneMark 16:8
They went out and fled from the tomb, for trembling and astonishment had gripped them; and they said nothing to anyone, for they were afraid.
G) Jesus meets the women as they leave the tomb and tells them to not be afraid and report to restMatthew 28:9-10
[8 And they left the tomb quickly with fear and great joy and ran to report it to His disciples.]
9And behold, Jesus met them and greeted them. And they came up and took hold of His feet and worshiped Him.
10Then Jesus said to them, "Do not be afraid; go and take word to My brethren to leave for Galilee, and there they will see Me."
H) As the women leave the tomb Peter and John go forth
3So Peter and the other disciple went forth, and they were going to the tomb.
4The two were running together; and the other disciple ran ahead faster than Peter and came to the tomb first; 5and stooping and looking in, he saw the linen wrappings lying there; but he did not go in.
6And so Simon Peter also came, following him, and entered the tomb; and he saw the linen wrappings lying there, 7and the face-cloth which had been on His head, not lying with the linen wrappings, but rolled up in a place by itself. 8So the other disciple who had first come to the tomb then also entered, and he saw and believed. 9For as yet they did not understand the Scripture, that He must rise again from the dead.
I) The disciples go back, but Mary stays weeping and sees 2 angels
10So the disciples went away again to their own homes.
11But Mary was standing outside the tomb weeping; and so, as she wept, she stooped and looked into the tomb; 12and she saw two angels in white sitting, one at the head and one at the feet, where the body of Jesus had been lying. 13And they said to her, "Woman, why are you weeping?" She said to them, "Because they have taken away my Lord, and I do not know where they have laid Him."
J) Mary sees Jesus!
John 20:14-1814When she had said this, she turned around and saw Jesus standing there, and did not know that it was Jesus. 15Jesus said to her, "Woman, why are you weeping? Whom are you seeking?" Supposing Him to be the gardener, she said to Him, "Sir, if you have carried Him away, tell me where you have laid Him, and I will take Him away." 16Jesus said to her, "Mary!" She turned and said to Him in Hebrew, "Rabboni!" (which means, Teacher). 17Jesus said to her, "Stop clinging to Me, for I have not yet ascended to the Father; but go to My brethren and say to them, 'I ascend to My Father and your Father, and My God and your God.'" 18Mary Magdalene came, announcing to the disciples, "I have seen the Lord," and that He had said these things to her.
For more answered contradictions see the links at the bottom of this page
Gospel Contradictions Answered! Part 1
Gospel Contradictions Answered! Part 2
Gospel Contradictions Answered! Part 3
Gospel Contradictions Answered! Part 5