Tuning is a completely self taught skill. Ask any of the big name tuners. They'll tell you they read the few books available on the subject, spent a lot of time on tuning boards, and spent even more time actually tuning cars.
Taking a class isn't going to get you anywhere near the knowledge base required. You just have to grow a pair and start tuning your own car. Don't listen to all the flamers saying you'll blow it up, in fact, don't listen to anyone who doesn't do any tuning themselves.
When I first bought my car, at 40k miles back in 08, I payed for someone to tune my car. I was overall unhappy with how my car performed after the tune. Still had spots of hesitation under light throttle, mpg actually got WORSE, and boost was all over the place depending on temperature.
Instead of paying someone else to fix it, I decided I was going to figure out how to do this myself. So I did exactly what I explained above. After a while (maybe 6 months or so of playing with the tune here and there), I corrected all the problems in my tune, all while GAINING 30whp and GAINING 2mpg on the highway.
Then at 60k miles I put on a bigger turbo (vf39) and injectors, and once again tackled the tuning myself.
Now it's 2013 and the car has 143k miles on it. Still pulls just as strong as it did when I first did the swap, and she sees redline on pretty much a daily basis.