I recently towed my first TT ever and it was a 28' beast. I will second what has been said that the first thing you must overcome is the fear. Driving with confidence and controll is important.
One thing you can do to get used to backing up a trailer is just rent one of those 16 or 18 foot yard trailers from home depot and practice with it. You can see plain over the top of it while practicing. Spend a few hours backing it up into parking spots etc and when you move to your TT, even though you wil not be able to see over it, you will have a more instinctual feel for what will happen when you turn the wheel.
The 7pin wiring... Our truck was a 99 'burb with the tow packacge. What that meant was (AS far as wiring) that it still had the 4 pin adapter but they had run two wires from the relay block under the hood all the way back to the rear bumper. They were taped up out of the way at both ends. One is for the brake controller, the other for auxiliarly power.
Since those wires were there, the brake controller install was somewhat easy. The Brake Controller sits in the cab of your truck so it needs to have a heavy dudty wire to the battery, a thin wire to a port on the truck that tells it when the brakes are pressed a short heavy duty ground and a long heavy duty wire back to the 7pin connecter. Most newer trucks make this pretty easy as there is a single port that you can plug into with the propper adapter. I did not have that luxury on our vehicle.
On the hitch end, I purchased a new 7pin recepticle that was made to plug into a 4 pin and had 2 extra wires. Instead of just plugging into the existing 4 pin, I clipped both connectors and spliced with a crimping connector then wrapped the whole thing with plenty of tape.
Current RV - 1999 Bounder 36s
Former trailers - '94 T-2770
'08 Keystone Sprinter 299BHSS