One thing I tell myself when I want to try new things is something I picked up from a friend that I ride with and that is that the fear in most cases is greater than the trick.
Indeed. The fear is always greater than the trick. Well, almost always

I'm afraid to do 3s, even though I landed my first few attempts. Don't know what it is, but I need like a
perfect jump setup otherwise I chicken out.
You just have to not be scared to fall because it's going to happen.
And 9 times out of 10, it doesn't hurt anywhere near as badly as you thought it would. I
busted my ass a few times last Thursday frontboarding this rail. Got up and did it again. Didn't stick any of them, and got a real nasty bruise right on my ass crack, but honestly, it never really
hurt. I've washed landings on jumps, I've caught edges over-rotating a spin or coming down off-balance or whatever, and you
think it's going to really hurt. It almost never does.
I'm not saying your bulletproof (none of us are) but the psychology is what's keeping you scared. physically, you're not likely to
really hurt/injure yourself until you start throwing yourself off 30+ footers and inverting and kinked rails over 20-stair sets on concrete. When you get that good, you won't be worried about getting hurt
But yeah, now when I want to try something new I just picture how I want it to go in my head and just hit it. Most of the time it doesn't work out how I picture it in my head the first time but I just keep at it until it does.
Dood. If you can get yourself on video, even crappy video from a digicam or cell phone, it helps. you can usually watch it and watch one of snowprofessorrick's videos or the guys from snowboardaddiction.com etc., and you should be able to see what you're doing wrong. From there, you gotta force yourself mentally to adjust and overcome the bad habit(s) that you've built up over the years, but it's a great place to start.