A lot of people say be hardcore, try as hard as you can, be as fired up as possible, etc. But really, I find that when I'm feeling chill, focused and confident the tricks come really easy. They just feel better to do when the body is relaxed a little bit more. Like you don't want to be all tense. A deep breath before trying something, then just thinking of how dope it is to be riding, makes whatever I do just so much less intimidating and I usually stick it then.
Also, don't let it get you down. If you're having fun, all happy and stuff, then it's just the best time ever. Tricks will be stomped and if not it doesn't matter, you're having fun. You'll get it if you keep trying it, but don't let it take away from the fun if you can.
As for tall tees and baggy stuff, I honestly ride better with tall tees or baggy shit. The confidence is up there so high, like you're channeling energy from the steeze gods or something. Plus it's fun to know that everyone thinks you look like a retard and not give a fuck.
I absolutely suck for the amount of time I get to ski, and where I ski. For a couple seasons I'd always be bummed because I knew I was worse than everyone, but recently I just decided it doesn't matter. I'll progress at my own pace, not be pressured or whatever, and that makes it less intimidating trying new stuff too. Then I progress faster. Learn tricks because it's fun, because the feeling is awesome, not because it gets you respect, or it makes you more of a "legit skier" to be able to do bigger tricks.