I'm covering one right now with Monokote. Even though I've covered many airplanes and have gotten good at it I was a bit rusty and the first couple of parts didn't look so good. Then I got back in the swing and they are coming out better now. Like the man says, "practice, practice".

It has to look just about perfect even before you shrink it so tack the corners and if it don't look right, untack, pull and retack until it does, then go around pulling and securing all the edges.