Let's take a gander at Psalm 22 in order to highlight the difficulty of interpreting prophecy. It is messy even when we already know how it is fulfilled, and we expect to know how unfulfilled prophecy will come to fruition?
Psalm 22 is a lament psalm. After you get done reading it, you can feel the intensity of David's emotions. He is feeling a great deal of pain. David starts out in the first 12 verses of the psalm contrasting his present trouble with God's past mercy. He points out to God that he has helped others in the past who called on him, and he asks a simple question of God, "Why won't you help ME now!?" In the second part of the psalm (13-22), David focuses on his enemies. They have him surrounded and want him dragged away and killed. David calls on the Lord for deliverance and thanks him ahead of time for his salvation. In the last part of the psalm (28-31), David invites people to praise God for helping him and for all those who suffer and are mistreated.
If we just had Psalm 22 by itself without any New Testament reference to it, we would simply view it as any other lament psalm: a record of David's trouble and his request that God help him out of it. However, the New Testament quotes and alludes to the psalm a few times as prophecy. Most of them are implicit, but the one in the Gospel of John is very explicit. So, in what sense is Psalm 22 prophecy? It definitely is not written like prophecy. It is written like a record of David's trouble.
The church as a whole has long regarded Psalm 22 as a prophetic messianic psalm that details the agony of Jesus' suffering (22:1), the brutality of the crucifixion (22:16), and the joy of the resurrection (22). They cite John's use of the psalm to prove this theory. Let's take a look at this portion of John:
Now when the soldiers crucified Jesus, they took his clothes and made four shares, one for each soldier, and the tunic remained. (Now the tunic was seamless, woven from top to bottom as a single piece.) So the soldiers said to one another, “Let’s not tear it, but throw dice to see who will get it.” This took place to fulfill the scripture that says, “They divided my garments among them, and for my clothing they threw dice.” So the soldiers did these things.
Prophecy is difficult to understand EVEN when it has already been fulfilled. Now imagine saying with certainty that the beasts of the fifth trumpet (Rev. 9) are actually going to be Huey Helicopters! What are your thoughts?