I've done several. More than several actually. I get parts from
RV Shade and Blind Repair. They have pretty good tutorials on their website.
My tips:
Do the work on the blinds indoors. The slightest puff of wind will mess you up and make you crazy.
You will need a large flat surface, like a dining room table. Not a floor!
Wash your hands often. Keep the blinds clean.
Having an assistant might be nice, but it really is a one person job if you're not in a rush.
The hardest part is getting the blinds back in. But if you're patient it can be done by one person. Always hit the center screw first but don't tighten any of them until they're all in.