Whoops are just like sex and skiing....
First, you got to think you're good at it. Then, it's practice, practice, practice... :confused:
Watch other riders.... ask for a "compentent" rider to watch you and suggest some tips. Avoid asking a "pro"... they attach them in a much different manner and speed. Not really appropriate to learning how.
And be patient. You'll go up and down and roll a lot of them before it clicks.
Stay loose, always have positive throttle, and keep your vision long (don't stare at the foot of dirt in front of you bike).
Oh yeah, and "think" you're good at 'em.... <grin>
Cheers! - Randyb