Boat Launching

My mother sent me this joke.

I don't own a boat, but know many who do!
I think they know what they are doing....?
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I just bought a new boat and decided to take 'er for the maiden voyage this past weekend.
This is my first boat and I wasn't quite sure of the exact Standard Operating Procedures for launching it off a ramp, but I figured it couldn't be too hard.
I consulted my local boat dealer for advice, but they just said "don't let the trailer get too deep when you are trying to launch the boat".


Well, I don't know what they meant by that as I could barely get the trailer in the water at all!
Anyhow, see attached picture, and tell me what am I doing wrong??.