With the advent of the LED, things have become far less complicated for the installer. As long as you count up wattage, and use a very good connection, just about anyone can wire up a system now. Notice I did not mention design, that is a whole other ball of wax entirely. The halogen systems are a little bit trickier, but are by no means rocket science. Learn the basics to safe wiring and good connections. Mike, there is no reason you couldn't hone your skills and be that guy that people call to do their lighting. It is a good business and one that is always evolving with new technology. Perhaps joining the AOLP and taking the CLVT course would be a good way for you to start on that road.
Best of luck