The handle on my bathroom window has been giving bother for some time now. When it works properly, it sits at 3 o'clock when closed, and you press a button and move it anti-clockwise to 12 o'clock to open it. The handle did not move any further left than 12. Gradually over the last few months I've had to move it further and further left to open it, until it got to the stage where the handle was hanging almost too low to be able to open the window. It now just spins randomly, but the locking bars are out in the closed position while the window is open, meaning I can't close it any more, as the locking bars are in the way. Does this sound like something that would be easy to fix myself, or would I be better getting a locksmith/window fitter in? Any idea of cost? I'm currently scared of trying to take the handle off, as with the window stuck in the open position chances are I will drop bits outside!!