"bum to the wind" is a good place to start
and finding a more sheltered spot helps - walls cause buffetting in strong winds but hedges tend to disperse the wind, you can use your car to create a partial windbreak too. I use our windbreak to channel wind away from the front of our tent but it is a hefty Canvas job with long wooden stakes and guys, a lot are too flimsy to help and best left down
under trees is bad, if a branch breaks off it invariably falls point end first and a big one will go through a tent roof easily
double pegging can be useful but dont strain the tent too much - very tight guys will add to the forces in the fabric so a tiny bit of give is better - really long guys can help there too
adding extra guys can be good to increase stability - so double up on main guys run at different angles, but watch the tension and dont over stress the tent
have plenty of spare pegs, we carry big rock pegs, V pegs and even deltas (good in some conditions)
dont forget to check the tent and guys occasionally, last July (anyone remeber camping last July?) we were in a viscious storm but our Pyramid was more than up to the job - except the rain softened the ground and the pegs were lifting. If I hadnt checked and double pegged we would have been in bother
and nejoy it, all part of the fun
