Riding a halfpipe takes a lot of practice. At first ride it as if it were a natural feature. No need to take air at first, just ride to the top of the wall and down through the transition with flow. Try to maintain a constant speed. Remember a flatter base will ride faster than on edge. Just like in skating, if the lip is vert do not boost off it lest you land flat in the center which can ruin your day.
