I had a painter in recently, he charged €200 per room, standard 4 bed semi. I had to buy the wall paint but he supplied the paint for woodwork. This price did not include doors or radiators. I had the whole house(inside) painted 2 years ago and was charged €2000 not including any paint but including all doors and radiators. Both painters were professionals who had done apprenticeships and knew a lot about paint. I've had the outside of the house painted by an untrained person and was happy enough with this but unless I knew someone personally I'd be reluctant to allow an untrained painter inside - too much potential for collateral damage. If you're any good at wallpapering you might try that out as well, it's impossible to get people to wallpaper and it's becomming very fashionable.