there are alot of variables to take in when going downhill. i just try and keep my speed low either by standing and "absorbing" the force or if there is room, slalom. another thing is of course skipping or skidding, which i can't afford to do too often, because good tires are expensive. but i think practicing these type of techniques is important if you're not going to put on a brake. if the hills are really that steep maybe you should just put on a brake.