I was pleasantly surprised when I did the pickup change the other week. Yes, it is slightly more involved than other guitars, but not nearly as bad as I was expecting. I had done a similar job years ago on a Westone Rainbow, and my vague memories of that were making me put off doing this job... But it went OK when I decided to do it. Just make sure you're particularly organised for this type of guitar, all the bits etc that you want are ready, so you don't have to go searching or improvising too much in the middle of it... and make sure you have set aside a good bit of time - it will go better than you remember. I set aside all of a Saturday from 7.30 am or so (I didn't get up early, that's just when I'm up and thinking about my hobby on Saturdays, if allowed :lol:!). I took it very leisurely, including a long break for coffee, buns, and a natter - and I was finished and playing it by 11.30 or so.
I did replace the caps at the same time, mainly because my Mules were already paired with some Vitamin Q PIOs in the other guitar, and I do like what they do together.
I think I'd go with BigB on a definite PIO caps recommendation. Not so sure on the 50s wiring myself, though. When I tried it a few years ago in a couple of guitars I was a bit disappointed. I was expecting an extra sprinkling of "vintage magic"... I could hear some difference, I think, but not enough to say it was noticably better for me either way... but the big thing was that volumes and tones interract a lot differently than I'm used to - and I use/rely on them a lot, so that was a big downer as far as I was concerned. I changed both guitars back within days/hours. So, unless you already know you like 50s wiring, I would not recommend trying it for the first time in a 335!! :lol:
I didn't bother with replacing the pots. The ones in mine are already CTS and they weren't upsetting me. They seem to react like "500" rather than the 300s I found in another Gibson - so I didn't even bother looking at them closely when they were out. I'm now realising, reading this, I might have been quite lucky - I wouldn't have found out I needed to change the pots as well until it was all back in and restrung! :lol: As it is, I'm extremely happy with the results so, unless something falls off inside, I'm not expecting to perform surgery again for quite a while...