do you mean remove the window or the glass inside the window frame which is easier and less trouble.in this house my chippy mate removed the rubber, then went outside removed the beading by snapping it back and then the glass ( this is a 11 year old window), we passed in a 3 piece windows back all in less than 15 minutes
when we replaced the 3 piece it took me 40 minutes, well my first attempt.
you will be surprised how easy it is, then you realisle burgulars probably know all this