Here is an idea for self-service docking practice
Place two buoys, 10-50 feet apart, in an area with a safe depth for at least a 100 yard radius. You can find small (4" square) buoys, with auto-deploying weights, at fishing and boating stores. Here, you can't hit anything but the buoys with your prop.
Take practice runs up to the buoys, varying sides of the boat, wind direction and speed. This is similar to flying lessons. First, practice docking touch and go's then try bring the craft to a stop. Learn to back away or go around. This is especially useful when you make a bad approach or feel a pinge of panic. Every good captain needs several attempts now and then.
These exercises should build your confidence for executing smooth landings on smooth days. Once you get the hang of it, try a public dock and see how good you are. Weaving among boats, and squeezing into a slot without hitting expensive stuff can test your skills. Work up to it.
Know the limits of your boat. Some pontoon boats act like a sail in the wind, and don't turn well. You have to become part sailor to pilot them well when it is windy. Practice out in the open first.
May all your landings be smooth.