petersonra said:
The most important thing to remember is the boss is not always right, but he is always the boss.
Welcome to the forum, and I would like to second Peter's boss statement.
Everyone here has offered great advice, though I would also add another layer to the "ask questions" comment. There are no stupid questions and when you're dealing with something for the first time your boss or journeyman (if you're in CA) will expect questions; ask them even if they seem stupid to you. If you are watching them do something complicated, have them slow down a little and tell you what they are doing. Learn to feed wire correctly and
always label your circuits on both ends.
Another trick I picked up from years ago was to "parrot" back what you were told to do. Put it in your own words and ask for clarifacation if you do not understand something. I think I averted more disasters by doing this.
Another thing, don't be afraid to speak up when you think something isn't right. If you have a good journeyman/boss he will show you in the NEC where such and such is and why it allows you to do what you do, but that will come after he tells you.
Read the NEC, especially sections partaining to what you are doing. Learn your strapping for the different conduits and raceways and romex.
Most importantly have a good attitude and appearance. Know when its the proper time to BS and the proper time to work hard. Cover any tats if your doing service calls. Also, remember to have fun!