There are quite a few wrong ways to avoid:
If your heatsink comes with a protective plastic sheet over the thermal interface material, you are probably supposed to peel off the sheet before placing the cooler on your processor.
If you have a floppy power connector, don't attach it to a 4-pin fan control header on your motherboard.
If your case has relocatable standoffs for different sizes of motherboard, be certain that you don't have an extra one grounding out your motherboard where it should not.
If you are assembling a very compact case (e.g.: some of them from Silverstone), the order of assembly matters much more than it does in a large ATX tower case. It is frustrating to have to undo seven or eight assembly steps to go back to the one that you skipped.
Actually I had a little moment of hesitation, heat sink covering M.2 SSD slot had two layers, one black, thick, soft one feeling like very soft rubber and on the top of it was a thin, blue, transparent plastic one.
I assumed that the outside plastic one was just a protection for the "real" thermal paste equivalent soft part and I removed it.If you have a floppy power connector, don't attach it to a 4-pin fan control header on your motherboard.
Hmm, I do not understand that one. Please clarify...
Assembly order, do you think that TR guide order will do the trick?