<< The main thing to remember is to stay away from stereo places. >>
I tend to disagree. The high power audio guys do far more complicated installations than the average ham rig and often deal with much higher current requirements.
Antennas are another matter; use a commercial two-way shop if you aren't comfortable doing it yourself.
FWIW, I've probable done 75 antenna installations over the years and haven't ripped a headline yet. (knock, knock,
Lon - W3LK