Do's- learn as much as you can, even if it's in an area which isn't your "job". There are lots of opportunities for folks who keep their eyes & ears open. Take pen & paper notes, like LaGrange advises, nothing like loosing tons of info when an electronic gizmo crashes. Treat the techs you serve w/ respect, even the pain in the a** ones. You never know when one of those pain in the a** techs will be able to pull you out of a jam.

Don'ts- don't get into the habit of short cutting when looking up parts- nothing like arguing with a tech that the part you supplied is correct when in fact it's wrong- do due diligence on every parts order. Don't talk about co-workers to other co-workers- it ALWAYS bites you back- & HARD!

In the end this is a very rewarding career. I've been doing this 30 years & still going. It's made me a comfortable living raising my family with decent benefits & hours. Good luck!