If I don't hit the turn signal lever/ head light dimmer hard enough the headlights turn all the way off, until I hit the dimmer switch again. It only takes a second, but a second is a long time at 75mph. How do you change the dimmer switch?

Have you ever done this kind of work?
This requires partial disassembly of the column.

Attachment 32362

Special tools and a little experience would be worth at least seeking a couple estimates from local shops.
Call around and ask about their electrical experience. Ask about warranties and be certain to get it in writing.