make sure you have a jack and a peice of cloth to put between the door and jack. Put the jack in the middle of door to help keep the door level. But yes i would change everything on the doors. Atleast the pins and bushing.
I had to grind my door pins off with a 3" cut off wheel on my MAC grinder. I had to use a worn down wheel though, otherwise I would have scratched the paint on the door jams with the grinder!!! Don't want that.
Keep in mind if you do it this way, you will scratch your paint on the hinges. I don't know anyother way to cut the heads off. I was painting my car after this, so I didn't care.