The only thing that I can add is for taxiying. Make sure that you hold the stick back to avoid prop strike and as everyone else has pointed out they are bumpier than tarmac airfields so the best advice I can offer is to taxi far slower than you normally do to avoid banging the aircraft about too much. If you see a depression or bump then I find that it is best to taxi over it at an angle, again mainly to avoid the possibilty of a prop strike.
Regarding Sywell, my advice would be to get there early before I do and watch my landings in the Katana as this will make you feel much better about your efforts!
