I use this method,
almost always. You must have in mind though, that your engine must be still within the "trim range" and not in the "tilt", because if it doesn't and you push the throtle a little bit more, the engine will tilt downwards until it reaches the trim limit. This happens because of the bypass valves open at a far less pressure within the tilt range than in the trim one.
Now if the bottom is too high (or the water too low), you might hear that "shkrrrrkkk - doop" noise of the leg shcratcing the slipway.
Michael a.k.a "Bat Falcon"