Good advice on a calm day or in protected harbor .Try that with fast moving current or 40 mph cross wind. Then you Gotta come in hot. Even if backing in.

pick up some swimming noodles and pvc pipe to fit inside, should be same length as boat. go into area away from other distractions and practice your approaches. note; little can be a lot sometimes. this is how I learned in service. the drifting helps compensate for off/on dock winds.

Worry less about people watching and more about how gorgeous your unmarked fiberglass is... I had a 32' with twin 454's .. It was a pretty heavy boat so that helped quite a bit... For the most part I approached DEAD SLOW.. I would come off the throttles completely until my glide was correct for wind/current/whatever.. Eventually I got to where I could get in our 12 foot wide slip in a 10 foot wide boat without anything touching. Be damned the people watching me..

Patience is the biggest thing I found to help.. Of course if you are somehow in an unprotected marina and wind and waves are crazy the method I just mentioned is going to be difficult...

If there are 40mph cross winds I'll just sit on the dock!

My slip isn't protected and in the Spring the wind is coming from the worst possible direction. I find that I don't need to come in hot, but I do need to be aggressive with the throttles. If you find the right mix of forward and reverse power (sometimes pretty significant RPM), you can trim the boat then back in smoothly. Usually takes a time or two though