Do you really need to go to a school? I had a colleague who was a software engineer and decided in his 30's that he really wanted to be a Porsche mechanic (he had just bought a 71 911). He went to one of those outfits you see on TV all the time and graduated at the top of the class, and went to work at an Audi dealership for like a year before he left and went to work for a non-specialist shop. He told me that he could have just started working in a shop and learned on the job, but I guess you need to get a foot in the door somehow.