Having just done the kitchen sink job I can brandish my experience....
The supplied instructions are clear; hand tighten only the *O* ring sealed male tail. There is also a 70deg.C limit on hot water and 65 preferred.
The other end on mine is a flat washer sealed female tap connector. When I tried to tighten this to the supply pipe, I found the coupler rotated and twisted the flexible pipe.
Mindful of the recent thread about life/damage I slackened off the olive clamp and allowed that to rotate instead.