Docking a Full Keel Heavy Displacement Sailboat

[Abrain]

Hello

First off I admit that I am terrible at docking my home. On more than 3 occasions I have hit the dock or ran into something. I also have had a few close calls with my neighbors boat where my bowsprit wants to kiss his stern.

So whats the best way to dock a heavy displacement full keel boat?

I am under the impression speed is needed to steer the boat, so I try approaching the slip with speeds over a knot. Then I swing wide and make the turn in a effort to head into the slip but it never works that way. I then slam the motor into reverse and give it some RPMs to slow this weight down. By this time the boat is crossed up and people begin filming for youtube while others come running asking for a line.

I would love to take a docking class but nothing is in my area. Whats your advice? I know I need practice but where can I get some so that I dont tear the new expensive cheaply made boats apart.