It used to be fairly perilous, i was always anxious, but since January perhaps not any more.
Upgrading is one of those activities I am looking forward to no matter how crazy that might sound.
Although I am still a true definition of a noob, I have gathered 4 or 5 commands that are required, 2 or 3 that may save my life,
and with this arsenal plus suggestions from Phil in post #1 as well as all the input from our dear users -
I have never felt safer in my entire life, ie. from 2000 when my Dad bought my 1st desktop PC with W 98.
Manjaro is #1
p.s. I have never upgraded any of my windows systems aside from SP upgrades.