Hello everyone, if you are removing heatsink only to change thermal paste - the main problem is 5th screw near i/o board, to get him you just need to disconnect antenna cable, it covers this screw. You can see its connectors on pic 20 , left side. so you don't need to remove fans, cables, i/o board to get heatsink. The biggest problem for me was to plug in again 2 antenna connectors after job was done. they are tiny that's why so difficult to plug in. but this way reduces risk to damage anything.

Removing 2 antenna connectors has less chance that anything goes wrong vs i/o cable, fan cable, i/o board etc