I fitted a new x type last week (first time 😮 )
Probably no need to face unless the frame is new or just sprayed
Measure bb to make sure you’re within tolerance
clean and double-clean the threads so there’s zero grit
the bb should wind on freely, if any resistence back it off and start again – don’t want to cross threads
+1 as above make sure you use the right number of washers
+1 tightens to hard stop, long handed tool is better
+1 read AND the understand manual first
remember to grease where you need to
I took an educated guess on the chainline setting but because I fitted a double front ring the chainline was less critical