This isn’t designed to answer the OP question because I know he is experienced.
For new boaters what wrecks the launching experience is the pressure to be quick. If I had to advise a new boater the first things I would tell them they have to master is:
1) Go to a school parking lot after hours and practice backing up. Not only in a straight line but around corners. Realize how fast the trailer reacts to turning the steering wheel. Realize the coverage your mirrors have and when there will be blind spots.
2) When at the landing stop in the prep area and get the boat ready to launch. DO NOT do it on the ramp. Be sure you have the key, install the plug. Remove the tie downs. Hook up the retrieval line. Get all the coolers & gear into the boat. Leave the wife and kids either on shore or stick them in the boat. You don’t want to worry about running a kid over or have to listen to your wife tell you how to do it while trying to back down the ramp.
3) Try to get the rig as straight as possible then start backing down the ramp.
These few things will make your day much better and less stressful. I know a new boat is exciting and you can’t wait to get on the water. But practice is important and so is understanding the whole process. It doesn’t hurt to stand at a landing some day and WATCH other guys do it, you may gain some knowledge and see something that will help you.
Oh, how could I forget this……….be sure your battery is charged and the motor will run.