It is probably a good idea to leave the winch cable attached so your boat will not launch itself prematurely. If the boat ramp is wide enough for three boats to be launched at the same time, don't take up two spots. Make sure whoever is backing your rig into the water knows how to back a trailer. Finally, don't pull your boat back onto the ramp to wait for your partner to return. Most ramps are very slippery, and it is sometimes hard to see a boat, especially a small one, when you are backing a boat and trailer down a steep ramp.
Most ramps have docks to tie the boat to load passengers.
Now that you are in the water and your blood pressure is up, you have to watch for anchored boats in the middle of the waterway. Though it is not illegal to anchor anywhere in the river, some people think the best spot to fish is in the middle, especially around a blind curve in the river. As you are responsible for your wake and the damage it causes, you must take care. The best method to pass a small boat anchored is to slow down to a fast idle and proceed. If the boat is larger and there is plenty of room around it, proceed by it with your boat on full plane.