Everyone has to find a system that works for them and their boat/tow vehicle combo. When you develop that system, try to keep it as efficient as possible to limit time on the actual ramp. It burns me up when people sit on the ramp and do all their crap while others wait, especially on the lakes around me as many ramps are single lane.
My procedure varies depending on the landing I'm at. There are a few lakes I fish that the landing is so gradual that all 4 of my Jeeps tires need to be in the water to have the trailer deep enough to get the boat on/off for these not getting in the water is not an option unless fishing with a partner since they don't have docks either. Some are so steep that I can get walk down past the bow of my boat to board with the trailer properly in the water to launch/load. Things that need to be included in your system is at least some sort of mental checklist of things to do. Put your electronics on, remove rear tie downs, remove safety strap (not winch strap) from bow, remove motor support and or steering locks, check drain plug, make sure power is on, get docking lines out, pump primer bulb, etc, etc. I suggest you go in the same order every time to develop a routine. Do all this in the staging area or parking lot.
When it comes to backing your boat in, every boat is a little different. There's a sweet spot where you can launch and load your boat seamlessly. That sweet spot is going to change slightly depending on the angle of the landing, but once you get used to it you'll figure it out. I don't know what kind of boat you have, but if it has a drive on trailer, don't be afraid to drive it on. If it doesn't have a drive on style trailer, you can convert yours into one using side guides and possibly adding an extra set of bunks or rollers. If you have two people, put one in the boat and one in the vehicle, there's no reason to have someone standing there with a rope to pull the boat wherever. If your partner isn't comfortable driving the boat to the dock or backing up the vehicle, back the vehicle up yourself and get it lined up straight and as deep into the water as you can that you can still enter the boat. Your partner should be able to back you in the rest of the way after you enter the boat and then clear the landing at least to a place out of the way. If something takes too long in your system, try to think of a better way that you can shorten it up. The more you do it the more proficient you'll become. If there's a dock close, my system runs under 2 minutes of on ramp time. If I have a partner the actual launching time is about 45 seconds, loading is a little over a minute.