After one month I can finally sit in the saddle without pain and I've learned how to pedal without strain. Secret -use the right gear! I’ve decided to stop trying to tough it out with the steep hills. Some hills I can get up but others there is no point, walking is just as fast and less strain on the legs. I even found myself giving hand signals. I can’t do this all the time as it is tricky keeping your balance on a folding bike, the centre of gravity is not the same as a full size bike. I think I am ready to take some official lessons!