chev235,
I have done this task. If the pins are frozen in the hinge strap they must be removed, the hole over bored and new pins inserted.
There is a specific procedure outlined for replacing these pins. If followed to the letter, success will be assured.
If you have a small torch, even a MAPP gas propane torch, and a drill press with a vise capable of giving a rigid setup, you are probably all right.
Follow the directions for disassembly of the hinge exactly, and if you reach a point where you need 'machine shop' help, take that part to them for whatever work is needed.
The only sticky-wicket is removing a frozen pin from the strap. If you can heat it a little, let it cool and remove it intact, you have it made.
The strap then needs to be fixtured, perfectly aligned with the existing hole, for a overbore.
Take ONE off and take it apart...see what develops. Do this one at a time so you have the factory hinge for a reference. Good luck.
Stuart
