i havent done one but it seems like you just kind of grip it with you skis by kind of scisoring and just kind of looking up over your left shoulder as you innitaite the spin. thats my guess
You slide the rail, when you're about to get off the rail, you give the biggest hit on your side with your head. But trust me, you don't want do to that, that's not a rail trick. Do your rodeo off a jump.
If you have to ask, it might be better to actually hone in on your skills first. They should be, intuitively, easy for somebody with enough skill and experience
god damn phone. the main thing I focus on is bringing my right arm up and across my body looking for the saftey grab if your gping for the 450. try and over exagerate it your first attemp just to make suree you get it around
horrible spelling because i was on my phone but here's a video of what im talking about. Just make sure to start with your right hand back farther than you would think. I know my first try i landed at like a 630 so it takes a bit of tweeking to not overotate the 450