This is a Shortcut.
We've all worked at a job where the Lead Guy did not know jack. The Apprentice's were pushing the job and getting pissed because journeyman didn't know what to do was getting higher pay than them. You'll always be relying on the Apprentice's for the knowlege and trying not to let them catch on to your ignorance of it.
Your only shortcutting yourself in the long run. That J card means you know somthing more than the average electrician, not just parts. This is a good trade to get into and will take far, if you do it right.

JMHO
Rob