I found the pilkguns website invaluable for learning technique without any help. The lad has a way with words
http://www.pilkguns.com/pistolcoaching-shtml/
Definitely start with the hitchhiker guide... it's brilliant.
I had little to no 1-1 coaching and with reading e everything I could find and practising A LOT, my on after 6 months this was 86 which I thought was not too shabby.
If your gun has a dry fire feature you can practise in the house... let off is probably the most important part of pistol shooting... you can practise with just a black dot on a wall - it doesn't even have to be 10m, you are just getting your mind and your finger engaged - or disengaged as the case may be - totally zen man !!!