what can you do yourself in a condo renovation?

I'm looking to buy a condo that has to be completely renovated, generally speaking, what are some of the things you can do yourself vs. a licensed professional? Can you paint, refinish the floors (sand, stain and refinish) and update the closets yourself? I imagine a licensed professional when you do plumbing, electricity and gas but what if you are just installing new fridge, stove, sink in its original place? How about replacing bathroom and kitchen cabinets and countertops? Also, what type of job (painting, refinish floors, etc) needs a permit to do the work? Any feedback is greatly appreciated!