There have been some great posts recently on this topic, check out @than bogan thread/article on the leverage position.
Get a lesson! And practice on dry land with a handle attached to something. Watch that terry winter video 1,000,000 times and click frame by frame.
Skiing is generally NOT an overnight from zero to hero sport, but you actually have good fundamentals on the ski, it looks like you ski aggressively and confidently. You look comfortable on the ski in orher words. Not a sport for the timid...
1 great tip is when you learn how to stand in the proper position aka "stacked" (research this term) on the ski, do it All The Time. When you get up, when youre gliding, when you let go of the handle, etc. hope this helps!!