Well, there's a bunch of ways to do it. A red light helps but alot depends on how wary or pressured the gators are. It can be very hard to get within fish arrow distance with a trolling motor. The first arrow doesn't have to go thru the gator but simply get the barb into the hide. The second arrow, shot at close range usually, is the penetrating broadhead tipped kill arrow. Send it right thru the vitals and you have a dead gator. A 2nd lined arrow into the gator is always helpful in case the 1st one pulls out.
Back in the early 90's before this became popular, I used a half 2 liter Coke bottle bolted to my bow as my "reel" , construction twine as my line,a milk jug as my float, a Zwickey broadhead drilled to accept a finish nail as my barb, mounted to an aluminum shaft. The finish arrow was usually a standard POC shaft with a Zwickey broadhead. The combo worked ok though I did pull out on a nice 11 footer.
I know several guys who have used bowfishing rigs successfully and no float as the reel has plenty of line. They simply take the reel off and hand it to the guy handling the line.
I do think it would be difficult to do by yourself so I'd line up "assistants" with specific assignments.
Sorry if I rambled along too much and I'll defer to those who have more technical expertise than I.