but yes you must learn theory...some of it does come into play later on down the road - I use ohm's law not everyday, but every now and then I'll have to calculate something.
Had a battle once with an older journeyman who was trying to tell me 480 volts consumed less electricity - then I busted out the I*E=P on him
the work never bothered me too much. I'd been in farm and construction work before I caught on the power company. Theory? 6 years inside (app and 2 years JW) did not hurt.
Some days... visualizing how things would work out is a little tough... rebuild a section while keeping load on...cut this ...mack that... open here... jumper this ...got it? That can be a little tough. After a while you learn to eat the elephant...one bite at a time.
I can tell you there were days I would have killed my lineman or working foreman for a nickle. Most of those guys were top drawer, but we did have a few deadbeats who where always suprised when a plan worked out... very hard to work for...