One common mistake that I constantly see the guys at the park make that can't tre yet, is they just assume where the board is going to land after it rotates.
Just watch the board as it flips and follow it, rather then guessing where it will end up.
You might land primo, it might take forever to let it fully rotate because it hits your feet mid-flip, it takes a lot of practice.
I've had days where it'll take me 20, or so, tries to finally land a tre, but I generally get one within the first five attempts.
I can film a few of my own for you, if you think that will help you at all?
I'm useless in the popping department though, I can't teach that for shit, but maybe the advice on landing I gave will help.