Start with the basics first. Don't expect to go to a training and come out being ready to do major paint corrections on a daily basis. Sure, you'll learn to do it at the training, but it will probably be more information than you will be able to retain right away. Learning how to handle a polisher is easy. Learning how to deal with the variables takes a lot of experience. Every good detailer here has had moments where they have been scratching their heads at what they thought was going to be easy.
Start with doing good, solid cleaning and waxing/sealing. You will gain experience, begin to build a reputation and client base and you will come across plenty of "WTF" moments that will help you fully understand what you are learning at a more advanced training.
I also highly recommend putting yourself to the test before committing full time. There is a big difference between working on your own and friends' cars on the weekends vs. doing it day in and day out. It is physically demanding and requires an extreme amount of patience and focus.
I had someone help me today who just wanted to learn. He was in awe at exactly how many "details" really were involved in my process. Needless to say, I've never had anyone actually stick with it for more than a few days. They all seem to think it is washing and waxing Lambos & Ferraris. Cleaning carpets, headliners, rear windows, dog hair, melted crayons, spilled coffee, etc. from an SUV or minivan just isn't what they had in mind. You have to truly enjoy it or you'll start cutting corners and it will show.
