In reply to PT:
I strongly suggest you apply for a Jonathon Conville trust course. The trust was set up some years ago by Johnathons parents after he was killed on his first visit to the alps. It provides young people with a 3 day course with guides at a heavily subsidised rate (I think I paid about £35 when I did it). It is run out of Chamonix (well, Argentiere) and details should be available from the BMC.
Failing this expect to pay £70 to £100 a day for one on one tuition from one of the many alpine guides.