I use a giant led lamp with magnifying glass, a watch Repair Tools set, a movement holder, press pins, caseback openers, and miniature screwdrivers. I also have a pad to hold the watch and the movement when the aren't in their holders. I don't use the eye glass magnifying lens since I wear glasses and have estigmatism and can't see without them.
I watched a lot of watch maker videos and also DIY repair videos. Everything is sourced individually from either eBay or aliexpress or watch parts sellers online. It is sometimes a grind since you buys hands that are supposed to fit an NH-35A, but then realize they sent you the wrong ones or that the bracelet you ordered doesn't fit exactly my a hair.... Very frustrating sometimes! 😅
I wouldn't go for the Milgauss since they fetch a premium due to their discontinuation. The Explorer II only makes sense if you travel quite often between time zones or have family, friends or business in other time zones and if that's the case then a GMT is a must have. Personally the best Rolex in your list is either an Explorer or an Oyster Perpetual. The date just is also great, but the other two just have a better look.
To a certain extent yes, I've sold one of my custom watches before, but I'm not a serious watch maker. I'm a hobbyists making things I think look great and expressing myself in my timepieces.
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