If you don't know if your system is pressured and still want to do it. Wear long sleeves, crap pants, and some eye protection. The freon in the AC can burn the crap out of you. I know someone who is blind in one eye from the freon spraying in his eye. It's a piece of cake to do, took my like 2 hours. And it was my first major thing I did on my car.
-Fuel/AC line disconnects-
-New belt
-Dead pulley for the AC (Like a AC delete kit from FRPP or something)
-I can't remember the tensioner size, I want to say 13mm or 12mm, but not positive
-Some screw drivers
It is not hard at all. I did it, and at that time, I considered myself a rookie when it came to working on cars.