I try to break down the trick or feature into parts and work on the parts. Like small jump, bigger jump, bigger jump, or do 180's while standing, do ollies while standing, then start combining them. The point is to convince yourself that no part of the trick is beyond you.
I told my kids, "Someday, you'll have kids of your own." One of them said, "So will you."
-- Rodney Dangerfield.