I graduate with a EE degree in December and I have no regrets with taking the long way while I graduate (will be about 5 1/2 years once I'm done).
I've worked local Utility as a field worker (only visual inspections from below. No pole climbing for me).
Worked two Consulting firms that designed everything but Residential.
The MOST I ever learned was doing what bbaumer mentioned. Working with Electricians in the field. They helped our school construct a design that we made and you learn a lot from guys like that. I got a lot of: "Kid... here's why the design you drew up won't work. Now here is how we're going to fix it". Six months of that has made me a MUCH better engineer!
Now with that in mind... getting a union apprenticeship is great but that seems like overkill in my mind. However if you have a chance to work with electricians and get your hands dirty I would recommend it.
Regarding reference materials...
If you're VERY new to electrical design/construction picking up a few "how to" electrical books could help you understand some fundamental practices.
Pick up a copy of the NEC Handbook that is relevant in your area. That should be your bible!
Lunch and Learns as well as seminars are great tools to further your knowledge as well.
This forum is also a great way to readup on topics!
Lastly don't be afraid to ask questions at your firm and see why the company does things a certain way. If you work with a good group they'll explain. If you get some blank stares....
that may be a problem.
I learned (the hard way) that the best thing a Engineer can do is ask questions. Don't ever be afraid of looking stupid because if a person insults you for asking a question they most likely don't know the answer themselves
Good luck!