I would not recommend this, as it is basically learning it wrong and then learning it right.
Find a mellow down rail with not to low of a take off, one you feel comfortable with.
Come in with good speed, bend at your knees weight forward so you feel your shins slightly pushing on the front of your boot. come in aligned with the rail, look at the end of the rail, and then pop off both skis like you would when you pop on to a normal rail. The angle and your speed will ensure that you will get on to the rail, don't worry about that. It's all about committing, you can do it!