Try tightening slightly before loosening, also make sure you have the bit with the tightest fit so you lower the likelihood of stripping the screws. If you do strip them you'll probably need to use a hardened straight screw driver or a screw extractor set on them.

You may be able to use a bit of rubbing alcohol on the screw to help loosen the thread locker usually used to keep them in place.

If you turn the end of the spudger sideways to get it started you should be able to undo the clips around the edges with a guitar pick. There is some resistance from the thermal pad.

Don't mind at all, really cool you came across this here!

I've taken apart both the original 2013 Chromebook Pixel and the 2015 model and it is awesome how much power was fit into such a small space. My biggest dislike is really the soldered components which let it fit into a smaller space but greatly lowered the repairability especially when it comes to the storage which essentially turns them into bricks after a couple years of use if you don't have access to some fairly high-end equipment to replace the flash storage chips.

In my experience pretty much nothing is compatible between the two.

One is the LCD for video the other is USB for the touchscreen and possibly the webcam.

The bottom of the screen near the middle is the best place to start with a guitar pick and/or credit card and work towards the edges.

If the contacts below those keys were corroded due to liquid spilled or condensation you may need to replace the entire keyboard module. Replacements can be found online or on eBay fairly inexpensively.

There are a couple sellers on eBay with the bands. I believe the term to search is ‘W280 band'. The color selection isn't great but I was psyched to be able to continue using my watch rather than buying a new one and throwing this one in a drawer, especially since I went through the effort of getting it activated on Verizon.

If you don't want to reattach the rubber ‘foot’ or if you would prefer to use your own double-sided tape for easier future access you can carefully roll over just enough of one edge of the glue sticker to grab it and then carefully peel it and it should come off in one piece.

I haven't found anybody that sells an official replacement but it is sometimes possible to get a used one on eBay or it may be possible to assemble your own using a collection of smaller cells from Ali Express. You might be able to find a battery store like Batteries Plus or Batteries And Bulbs that might carry a close equivalent but I wouldn't bet on it.