GM-GMC: door lock barrel, mitsubishi magna, little bugger

Question
Ive got a mistubishi magna, but the mits. experts not available, but for my problem most cars are just about the same.

I want to put a new lock barrel in the drivers side door. I have removed the trim, which leaves a metal skin with the holes and access areas and I can see the old lock barrel but I'll be stuffed if I can get to it. The only way I see to get to it is to remove the skin as well, but Ive been informed that it shouldnt be necessary. Im a disabilty pensioner and havent got the money for a mechanic and Ive always been able to turn my hand to anything, but this bugger has got me bamboozled. Any advice would help.
Cheers
Fellow expert
Debra

Answer
To be quite honest I have never dealt with a mitsubishi magna, however, generally lock cylinders in doors are held in one of two ways.  By some type of large clip, u shape, that essentially wedges the lock cylinder against the door and holds it in place or by some type bolt/stud and nut combination as a part of the door handle.  Get a light and look up inside and see if you can identify what exactly is holding that little bugger in there, I know they can be really tough to get to on some vehicles.  I have had to remove window tracks and regulators to get to some of them.  You may need to remove the entire door handle assembly, usually a few rods and a couple bolts, in order to access the cylinder.
Hope this helps