That's pretty much the normal way it is done in the USA
You use the word "slipped" to refer to what we here usually call hauling the boat out. As such, I'm guessing you are not in the USA
. Correct? If so, the usual procedures where you are (or where the boat is) may be different.
Because this is an international forum, it is best for questions like this to be as specific as possible. So where are you, and where is the boat?