Wait for no wind, or it is very bumpy. I flew over the Cleveland Hills (and in the valleys over the resevoirs etc) yesterday and the wind was 10 to 15 mph. It was very bumpy. Also, you need to be prepared for big downdraughts. In the lee of a hill you can suddenly find your self descending.......quickly. Even full power can still see you falling! In one valley yesterday I had wind from the left. Staying close to the left side avoided the down draught, but moving just a little to the right put me directly in the falling rota.....1 to 2 m/s down on full power.