By the way, tre-flips are a great way to get hit in the groin if you aren't careful. Or, for most skaters, even if you are. Enjoy. The pain will help your body to learn to do the trick better, and it'll make a great story to tell your kids, though you might not be able to have any.
So, you are up in the air, feet held poised above the skateboard, and the board is flipping and spinning below you. Keep an eye on it, and watch for the grip tape. When you see it, you will want to catch the board with your feet. This is tough.
The first several (dozen) times you practice tre-flips, you will probably not catch the board right. If you do, nice job! If you don't, then there's your confirmation that you are in fact normal. Catching the board takes getting used to how you flip and spin the board, and getting a sense for how long it takes. You should slowly get a feel for it. The goal is to eventually get to the point that you don't even need to look down to catch it (though you probably will, out of habit. And that's OK).