I equate it to learning to drive a manual transmission car- Everyone stalls the engine a few times as they are learning but after a couple days of practice and you don't even have to think about what you are doing. Just keep at it and you'll be unclipping like a pro in no time. Until then I agree with the above recomendations of a doorway or in the grass.

Once you get comfortable with clipless you'll never want to ride platforms or toe clips again!