If you have experience in wiring and circuit boards, which I don't (not much anyway), then you ought to be able to fix yourself up with the help of the instructions included with the transfer switch.
Your local electrical shop will have what you need.
But it can be complicated and dangerous (the power surge that can come from the main transmission lines near your house, etc.) and a good electrician will fix you up for a few hundred bucks.
Worth it, and you can watch him and learn.
I don't...yet...that's why I ask. Current skill level is basic switch, outlet, lighting, etc. wiring...BUT willing to learn. YES and have a real electrician do the final inspection and hookup.