Sennadog:
Only one thing to add to the above excellent posts --
You said you would be flying at altitude. Are you planning to go into any mountain strips (steep slope, one way --land uphill, take off downhill-- maybe with no go-around capability after short final due to terrain). If so, remember these strips are killers to the unwary.
I did a bit of flying into such strips in the Alps (with a mountain instructor). Typically ten landings at each are required to qualify as well as much study and experience of mountain flying generally. The advice I had after my intro was not repeat not to go and do it by myself until signed off. That said, it was brilliant fun and I would reccommend it, but with a suitable instructor.
One final point, the PFA do a strip-flying course as part of their coaching scheme.
Enjoy....