1. The dash module IIRC is plug in, but I think it also has a cable pull that needs transferred. Its like a bike brake cable. Although I did this mod when I first bough my car, it has been 11 years..

2. You have to install the correct length belt. It does require belt work. There is a write up here:
https://www.aveoforum.com/forum/f94/...9-aveo5-15343/

3. NO programming will be fine. It just won't work. If you have a friend with the scan tool the steps can be found somewhere. I never properly charged mine, and it worked fine. I just used a can of r34 with oil and leak seal.. it was $15 at the time. I didn't have a dealership or anyone pull a vacuum or anything like that (I know you are supposed to).

4. I can't answer that. When I installed it, I did it in a day. I am "seasoned" as a mechanic though. I also have to tear apart more of the car because it was a first year model, no kit info was available yet, and I needed access to measure for bolts sizes, etc. It wasn't "proven" at the time. But I also shortened my shifter and modified other things while I have it apart..