I used to train commerical drivers, first rule is relax, take your time, don't become frustrated.
As mentioned, find a large parking lot. bring some cones or somthing you can use as a control line, even a rope laid out on the ground in a straight line.
Pull you TV/TT up ahead of the line, about 10 to 20 feet, make sure your offset from the line about 12 inches.
Imagine that the cones/rope being a center line. The object is to park parallel to the line. Now practice backing straightr back. The goal is to maintain an even distance from the line to your TV/TT the entire length.
Once you master this task, pull ahead of the line and back up again to the line, but on the other side. This takes lot of practice, but once you become profient at the task; you'll be able to back anywhere you need to. If your perfectly straight, when you back up you shouldn't be moving your wheel much. Moving it more than a half inch either way should be max, if you start going astray, the move your wheel to correct, but each time, try moving it less and less; in the beginning you will need to pull ahead to straighten up, make sure you allow a good pull up space where you practice at.
As others mentioned, practice, practice.
To eliminate any confusion about which way to move the wheel to move the trailer in the direction desired.
It's quite simple, sitting in the TV place your hand at the 6 oclock position, look into your outside mirrors, determine which way you want the trailer to go: right mirror, left mirror, then move your hand towards that mirror.
One last thing the shorter the trailer the quicker it's going to respond, longer ones are actually easier to move due to having more time to make a steering correction.
Practice practice.
Now about driving and making a right hand turn.
First rule is do not pull into oncomming traffic lane, instead go into the intersection straight past your lane and the then turn,making sure your TT doesn't hit anthing. Basicly the manuver would be simular to the letter p.
Good luck, everbody has thier first time(s), before you know it you'll be giving a hand to someone yourself
"You never fail until you stop trying!!"
My advice is free but I do consider donations