A great tip is to have trailer guideposts. They are intended to help center a boat while loading on the trailer – but I find them even more useful when backing the empty trailer down the ramp to retrieve the boat. When the trailer is empty, the tow vehicle can block your view and you have no reference to the trailer’s location until it is too far to one side or the other. The guideposts give extra height to be seen and not hidden behind the tow rig – mechanically eliminating lots of uncertainty/frustration and allowing the driver to have increased confidence.
Another small tip is to practice boat control in an open area of the lake. Nothing to hit and not in anyone’s way (similar to practice backing a trailer in an open parking lot). With no intention of fishing, put out a buoy marker and pretend that is a dock or trailer. Practice transitioning from high to low speed and slowly approach without driving over. This gives good experience without the added pressure from the ramp – and builds skills and confidence for the ramp.
Lastly, take your time. Most problems happen when folks are rushed and not thinking clear. Boating/fishing is meant to be a relaxing and enjoyable activity. It is not a race.
Enjoy your time on the water!