A/C work isn't hard after you've done it awhile, it's just the begining learning curve is a little hard. Theory is all great and what not but you need experience to tell you what to do if you have a problem. I thought after taking the class at the college and going through Honda's factory training I knew how to fix A/C systems good. I was WRONG.
It took a good two summers to really get it down to a profitable every day science without asking for help. I still see guys coming into the dealer who have an A/C license and claim to be a good A/C tech and have one or two cars a summer totally stump them. You have to really pay attention to the details of what the system's doing and work in a shop with decent equipment.

You know what you should do, find a community college and sign up for an auto A/C class near you. You could do the conversion on your car in class and get credit for it.
You can learn first hand instead of paying someone to do it for you. That's why I started working on cars in the first place.