Don’t worry how nice you bike is or isn’t (it’s spot on btw), just get out and jump!
A lot of guys on STW go down the ‘skills course’ route, which seems to work for them. See how you get on first and take it from there. If you ride with folk who know what they are doing, you’ll be able to pick their brains for free. If you’re still having trouble then Jedi will sort you out.
Start small and work up as your confidence grows. Buy a decent spade so you can fix up others hard work if you case them or build you own if you can find anything suitable to practice on (every DJ bike should come with a free spade).
At 20 your plenty young enough to get the hang of it. Nothing sadder in my eyes than someone who’s been riding for donkeys years and is unwilling/afraid to grab a little hang time. There’s so much soul in getting air.