classes are nice but whos got time? just read, read, read everything you can online. ive learned quite a bit in the last year since i joined one of the other nissan sites out there... i went to school back in 93 and got a degree in auto/diesel technology and i still learn more everyday... theres a wealth of knowledge online out there. try
www.altimas.net and see what you can learn there. im a member there as well as here, and if you can get past the assholes that dont like newbies, you can learn quite a bit.
Asleep.