Hi Glyn, John (Oldiron) is the man to thank really, I found his tutorial a boon and gladly I took his recommendation for the brush.
Don't give up! it does take as they say...............practice, practice, and practice.
Rather than wait till I have something that needs painting, I'll put time aside to do nothing else than have a play airbrushing. I prime up a few sheets of card with grey and white primer, I stick all sorts of scrap off cuts together any old how to form all manner of shapes, including corner and box type shapes, I prime these up and then just have a play! different paints, thinners, colours, varying viscosity, air pressure etc. etc. and try to enjoy rather than endure. I sometimes wish though that my model bits came out as good as the scrap!

Regards, Tony.