doors sag, need help

Ive got an 84 Z28 and the botton hinge pins are pretty much done for and i dont want to break anything, so any help/instruction in removal of the old and installation of the new pins would be much appreciated, thanks!

well, replacing the pins are not all that difficult, i havent done enough to really talk you through it step by step. basicly for the average do it yourselfer, you are better off replacing the entire hinge assembly. both top and bottom, might cost a little more but more than makes up for it in ease of installation.

plan B.... 2x4