Get some auto specific training by working. Alternatively there are resources such as elite worldwide trainings that can be had for little money. Check out the www.aaec.ca online elearning and or read everything you can ge your hands on by bob greenwood and others like joe the site founder here and writer for ratchet and wrench. Read motor magazine archives etc there is a ton of info online. Also customer link has a blog as does elite worldwide. One way to get educated on repair stuff, specifically drivability,
at home on YouTube is scanner danner he also has an ebook
Here are some links:
http://www.aaec.ca/newsite/elearning.cf
http://www.ratchetandwrench.com/
http://www.eliteworldwidestore.com/blog/
http://m.youtube.com/user/ScannerDanner
http://www.autosphere.ca/carcarebusiness/category/greenwoods-blog/
http://www.customerlink.com/auto-repair-marketing-blog/