It is easier if you learn by watching and practicing with the trainer. I went to mtb clinics where experienced riders (pro racers) showed us how to jump on a bike, go over the obstacles, ride stairs and... do wheelies. I guess I am fortunate because I am in California where I could learn from gals like Marla Streb and MTBChick.com Tonya Bray. But you must have some kind of mtb trainers in your area too! If not here is Tonya's web site: http://www.mtbchick.com/tonya.html
It would be fun vacation, right? Oh, and you should definitively do wheelies clipped in!

Danusia