I agree. My boat (which I also paid cash for) Has yet to leave the marina!!! BUT, when she does, I do want to avoid every possible thing that could sink her. So, it would be helpful for me to know the "how".
Anyway, I wish you success with your boat. You are braver than I am. If my boat sunk, I'd be searching for a another boat.
One thing to be aware of, Donna. Probably more boats sink at marinas than underway.