We prophesy in faith, and we prophesy in part.
I understand that Paul said we know and prophesy in part, and one day, it wont matter. But, there is another side to this.
It is important to know that God does not normally give us the entire prophetic picture for a person in one swoop. Most of the time, He gives us a flash, a one-shot picture or movie in our minds or an audible word or an impression or a word of knowledge about someone.
As we move out faith and carry that word forward, He fills in the gaps and releases more. There is a flow to what He gives. The 5 loaves turns into baskets of bread for the multitudes. We simply have to move forward in faith knowing that He will supply what needs to be said at the right time.