Actually your sailboat will tend to drift less sideways than a powerboat, and should generally be more easily controlled at low speeds due to the larger rudder. With a bow thruster there should be no great difficulty at all.
I'd just take her out somewhere where there's an open dock with little traffic and practice. You'll find with the thruster you can easily turn in your own length, and I'd expect that boat to behave quite well in reverse gear. The one thing possibly new to you after the twin screws will be prop walk, but again, with the thruster you should be fine.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)