Replying to Backflip help

So this is my first year skiing park and I have progressed really well. I'm comfortable doing 540's on small jumps in the park and grinding rails. I am starting to move into medium park and currently lap park lane in breck. Before the end of the season I would like to learn backflips before the end of the season but breck closes this weekend. So more likely than not I will grow a pair and do one. Is there anything I should focus on when doing it to make it go as smooth as possible? Should I try laid out or tucked first? And lastly what size jump should I try it on?