This has worked for me in the past (no bow thruster, too much wind to
push off): Take a line from a cleat on the pier (behind the stern of
the boat) to your seaward stern cleat. Fender your stern off. Helm
towards the pier, throttle ahead.... You may need quite a bit of
throttle and your cleat might start moaning but in the end your bow
will swing out just nicely.
Seems to be a manouvre that is not seen often, but it does work.