This is one of those tips…
Personally, I remove 99% of my hardware, including hinges. I am not saying a painted hinge is a bad thing, but when you are doing a super modern piece it just doesn't look clean, or modern, or right…so yeah, I guess a painted hinge can be a bad thing. I said it. Now I feel bad, but a little better
The unfortunate thing is that when you remove old hinges, it can be tricky to get doors lined up JUST RIGHT when reinstalling, so I assume that is my most people paint hinges. It's totally easier. I get it and I actually now charge a LITTLE more when refinishing a piece with doors because I KNOW I will be spending an extra hour removing and reinstalling those babies. I hate it.
A problem I also find with these old hinges is that often times the holes are stripped or too large to use a flat screw that will sink into the hinge holes and actually allow the door to close nicely. When this happens, there is a pretty simple solution.
I have a tupperware container full of different sized that I use for different reason as well as dowel rods on hand, for different "fix" it reasons. I find my dowels at Lowes, Homey D, Joanns, Hobby Wobby…they are all over