You're much better off rolling a nose pivot on a tight downhill switchback than trying a hop turn.
If you're intent on learning a hop turn, focus on your hips and shoulders. Too many people try to just jerk the bike around by doing a little "cheater" hop and twisting. It's really a lot more complicated than that.
Let's say you're right foot forward...you do these things simultaneously
put some power into the pedal
push the left grip down and forward
pull the right grip up and back
and twist your hips and shoulder around to the right
all while doing a bunny hop
You should also be looking where you want your body to be pointing when you've completed the move. It's difficult to describe, but keep at it and you'll continually learn little tweaks that will make it work for you. Once you get proficient, you'll be able to do 180 bunnyhops as high as your body will let you.
check out
www.observedtrials.net and register to view the movies people post. You're bound to learn something.