if its a door glass... wouldnt like to try myself especially on a recent car... doors have a lot of stuff in them - recent cars have bars in the door to reinforce it/help prevent theft.
Easyer imo would be to get a replacement door either at breakers or owners club.. easy to fit. the issue here is then the lock.. equally a pita to change... but you could try to get a key with the door
quater glass however is easy.. most you just pull out the rubber and the glass will fall out with it.