Hi I'm about to buy a replacement rear door as mine is dented beyond repair I've been offerd a bare door for £120 which seen as my car is the rare nautic blue I've no real choice but to pay it and the guy knows it :0 how easy it it to change all parts from my damaged door to my new door? I'm a decent DIY mechanic do everything myself on my cars but never changed a window any info would be appreciated. Thanks