For a three, take take a progressive edge to the wake just enough to go wake to wake. The old saying "pop, pull pass" AFTER you get your pop, start the spin by pulling the handle to your right hip while letting go with your other hand, reaching around and grabbing the handle. Once you feel the handle, complete the last 180 by letting go with your original lead hand, and attempt to spot your landing. The rest is downhill.
I personally think inverts are easier than spins, for most people. I know alot of people who can flip for days but can't land consistent 306s.