Hello, im new to these forums

, ive just bought a C5 54 plate (facelift ) its a lovely comfortable car and i am very happy with it, it does however be a bit of a pain to start in the cold so ive bought some glow plugs and was just wondering how much of a pain they are and how much time i should set aside ?
also i need to replace the drivers headlight bulb, ive tried doing it but failed think i might have to remove the headlight to do this now ? any ideas / advice ?
thanks
Anthony