Besides the standard procedures mentioned already, I'd like to make a few of additions:
A roller trailer, as opposed t a bunk, can make launching and retrieving much easier on shallow ramps where the bunk trailer has trouble getting in far enough to float on and off.
There are a number off additions to the trailer that facilitate easy launching-
1. A good set of guide-ons that are high and long enough are a major need for a boat the size of a 22 or 25. They should be up nearly to the rub rail in height, and run from the forward end of the front window to the end of the cockpit interior to be most effective. They are of invaluable help in currents and wind, but just make the whole launching drill more managable anytime. Pad them well and mount your clearance lights to them to keep them out of the water and less likely to get smashed in the parking lot.
2. Widen the tongue and place anti-skid tape on the surfaces to be walked on. You can also fill in the v-shaped triangle behind where the trailer side members join with the tongue with a waterproofed plywood sheet to be able to walk out on it to retrieve the nose of the boat and clip the winch line hook to the bow eye of the boat. A ladder on the tongue to the area above the winch post that can be used to climb over the bow pulpit, and takes you out of the arena of circus high wire performners who have hung up their aging bodies on the ground tackle.
Here's an excellent example of such a system from David's Anna Leigh:
Be sure you've got a secondary positive attachment hook/chain/device for the bow retention in case the winch fails on the ramp or while traveling on roads (applies expecially to roller trailers). If the winch ratchet fails, you don't want the boat sliding back off the trailer on either the ramp or the freeway. Had a friend who used to get so mad racing sailboats that he frerquently forgot to tie the boat completely down on the trailer before storming off to go home. Planed two boats down the highway, one on the Dumbarton Bridge which was run over by an 18 wheeler(!) And we thought his blood pressure was high when he left the launch ramp!
Just some more thoughts.....Joe.[/list]