Lots of good advice thus far. I would add, that while it may be simplistic, make sure you evaluate the situation (wind direction, speed, current, obstructions etc.) and have a plan of attack before making your approach. Don't wing it and react. Anticipate how that 20k crosswind is going to impact you.

And if it isn't working don't be afraid to power out and start over. Sure, people might be watching but that's a heck if a lot better than pranging the boat. Use what you learned the first time to nail the second pass.

Along those same lines, slips aren't all created equal. I've had my current boat for 11 years at this point and on an average Saturday we might dock 4-5 times. I have a lot of experience maneuvering that particular boat, but I'm not opposed to waving off a dockhand if they're trying to put me in a slip that I'm not comfortable with. Discretion is definitely the better part of valor.