Dag namit GT you took my question!
At least it makes me feel like a good coach and that I know what I'm talking about.
I'm... very flattered that you find us thinking alike a sign of you being a good coach.
gymstralo: there are two types of "tsuk full:" kazamatsu and tsuk.
A kazamatsu is when the direction of your twist is the direction of the hand you lead in with, and a tsuk is when they are opposite (ie if you lead with your left hand on the entry and twist left, it's a kaz; if you lead with your left hand and twist right, it's a tsuk full). Somewhat paradoxically (and I can explain this in more detail if you like), this means that a kazamatsu changes direction, whereas a tsuk full continues in the same direction. In a kaz, you basically do a 1/4 on, 3/4 off. In a tsuk 1/1, you do 1/4 on, 1 1/4 off. The kazamatsu is the easier of the two in my opinion, though by the time you are working this skill your twisting direction is probably already set and it's not worth the trouble of changing it.
If you're doing a kaz, it's actually a shockingly easy vault once you figure it out; in fact, I find a kaz to be significantly easier and more comfortable than a plain tsuk. It's essentially a tsuk arabian 1/2 out; done properly, you can see the landing for almost the entire skill. It feels more like a front 1/2 than a back 1/1. The key is making sure you spot the landing before that 1/2; if you do the final 1/2 too early, you're flying blind and it's almost impossible to land (not to mention extremely scary to do), but if you're patient and spot the ground (and this is assuming you have the necessary height and are comfortable with double front 1/2 out on a trampoline/into a pit/wherever), it's a very easy, natural-feeling vault. If you're having trouble getting the necessary height/rotation, focus on pushing back behind the head with the second hand (ie your right hand if you lead with the left) when you block. This will give you the first 1/4 twist, as well as the height and rotation you want.
If you're doing a tsuk full, I can't really give you any advice that's quite that specific, as I always did kazamatsus. I will, however, say that it will likely be helpful to have a very strong open-tucked tsuk, and to be comfortable with a front 1/2 in 1/1 out on trampoline (into a pit is fine, as long as you can spot the landing, and separate the 1/2 and the 1/1). There are probably other coaches who can help you more with this method than I can.
I've noticed -- and I'm not really sure why -- that guys coaches seem to tend more towards kazamatsus, and girls coaches seem to tend more towards tsuk fulls. In my opinion, a kazamatsu is much easier, simply because a front 1/2 out is easier to me than a back 1/1 out, though in all honesty there is likely not a gymnast on earth who can give a fair assesment of which is easier, as which one you will be able to do is generally set in stone long before you actually get to this level, as it has to do with your roundoff hand and your twisting direction.
If I haven't explained this well or it doesn't make sense, let me know and I'll see if I can break it down further. As I said, it will be very helpful to us to know which technique you will be using, as the methods for training the two techniques are very different.