Don't pry anything apart, you're gonna break things.

Instead unscrew the 2 screws holding the side buttons' board and the 3 screws holding the main board, then lift it which will free the scroll wheel from the protruding prongs from the enclosure.

You mean the 2 screws near the cartridge connector (as seen on step 7) are plastic?

I’m not aware of such a difference.

The innards of the Super Famicom are almost the same as the North American Super NES, you should be able to follow the SNES guides with the help of this teardown.

Did some research, apparently you don't want to pry off the heatsinks if you plan to put the unit back together and don't have thermal pad replacements (the rubbery squares between the chips and the heatsinks that's holding it together), otherwise some small gaps will form between the chips and the heatsinks when reassembling, which is obviously bad for cooling.