In addition to the take lots of pictures and label everything suggestions, when doing an upper PF teardown, I had a thick piece of cardboard placed securely on top of the game next to me and used it to (literally) hold most small parts - posts, screws, guides etc. in their relative positions as I disassembled them. I made notes on the cardboard itself including anything like, for example the location of bulb sockets that would help me position everything back in the right place. It was very useful when staring at the empty PF to have a 'copy' of the game next to me. And while I individually cleaned, polished or regrained metal parts as I put them back, reassembly was extremely easy, especially the top part of the playfield. I found I didn't need the photos nearly as much as on previous teardowns where I didn't take this approach.

Plastics, habitrails, ramps and other larger parts went onto another flatter surface that kept things from sliding around.

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I took apart my TZ before I did my Congo. Its parts are spread out all over... some parts are grouped but everything is pretty much strewn across 5 shelves, and a few buckets and boxes. I wasn't worried cause the machine is so well documented online I figured I could recover from any confusion.

The cardboard (rigid foam>>cardboard), pool table techniques and the like are a good way to avoid possible confusion. A lot will depend on your experience, game complexity and how long you plan to wait before you reassemble (memory). I assumed the OP was new to this, so slow and easy is the way I'd recommend to go.

I'm doing SoF next. No laying out of parts is going to happen. Some photos, a few cups or containers perhaps, and that's it. This game isn't very complicated, and the more often you do this the less you need to worry.