I've never done a GM trans, but I'm automatic and manual trans trained, from the dealership, on a import car line. I did work at a Pontiac dealer and saw what the trans guys went thru. If you know what you're doing you'll probably be ok. However, there are a lot of parts - they have to go together right. And then at the end of the job the valve body should come apart and be cleaned, too. I honestly think it would be a major challenge just to get the trans out of the car if you're trying to do it at home.
