Well I might get hung by my shorts for this one but here goes. I have guided now for 8 years, all the other advice posted definantly holds true.
One piece that I would add is, be wary of booking agents. I know that there are lots of very reputable ones out there, but there are some that gives the hole industry a bad name.
They just wanna book the hunt and make the commision, they will do damn near anything too book. It is a very competitive market out there for guided hunts.
Just an opinion.