I think in step 7 you should have everyone type M119 and make sure it reads all the endstop before people start crashing there machines. With your finder holde one endstop at a time and type M119 again and make sure it reads a trigger on the endstop your holding. I think 0 is off and 1 is a trigger.
I think it's a safer way instead of hitting the home button and hoping for the best lol.
And I don't know if other people had this problem but the metal bar on the endstops I got were almost to short to be triggered so I had to mount it in such a way that it worked. And I also didn't like how the switch on the circuit board could move a little so I glued it to the circuit board so it was solid and would be triggered at the same point every time.