Probably a repeat of answers my Catch Up button deleted but:

When you get on any new boat there is a 'getting to know you' phase. If
possible go out with the present owner and watch for quirks and odd
differences no matter how minor. Practice out in the clear water using a
soft buoy as a target point and approaching it from all directions. Take a
floating orange seat cushion and do some Williamson turns. During this use
whatever the boat has...single prop, twin props, forward and reverse, bow
thrusters whatever. Then bring her back in and cruise the harbor/marina and
practice on different empty spaces. Won't be long before the comfort zone
is reached. Also the comfort zone of the owner will appreciate as well.
Fun thing to practice with twin screws and bow thrusters is walking the boat
sideways or in a back, over, up, over pattern. Don't forget spring lines.
Finally, see what the boat will do in an emergency at different speeds and
conditions. Turning, backing down, Reversing. En route if you encounter
drastically different conditions....do a small test series til your
'emergency condition comfortable.'

If you are crossing the paths of large freighters aim to their stern but
don't follow the stern. You don't know what they are masking and as they
pull away anything behind them will be easily seen in plenty of time.

That's it

M.