It's a pretty involved job, but once you know
how to do it, it's much easier if you ever have to do it again. Fronts are easier than the rears as the window carrier bolts in for the front, but it's a push fit plug for the rears, which is easy when you know how, but frustrating when you don't. I took the glass out completely when I did my driver's side one.
I don't have the sizes to hand, but you'll need Torx bits to get the door handle out, and a triple square (12mm?) to get the lock itself out.
I'd definitely recommend doing some cleaning and regreasing 'while you're in there' - especially the exterior handle - the screw that holds the lock barrel (and the blanking plate on the passenger side) corrodes and seizes. Just give it a light sand to remove the rust and then some grease. Once you use the butyl to seal the panel back in place, it's a sticky mess if you have to remove it again, so everything else that looks like it needs doing, do it.
Can't stress enough, if it's on the original seals, scrape them off, clean the surface with IPA and make sure the butyl is even and there are no gaps. We all know the pain of wet carpets and steamed up windscreens if it's not perfect.
I've not had any issues with eBay locks myself - just don't buy the cheapest one you find. Some come with weather foam around the bit that's open to the elements - given how rusty these bits can get, you might even want to add your own. Some people strip the lock and grease some of the components before installation, but things can go wrong if you don't put it back together properly.
It's all pretty intuitive though and it's hard to go wrong - just don't rush. Everything should come apart without forcing. It's maybe a 1-2hr job.
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