The best tips for launching are: have a routine and always follow it, take as little time as possible on the ramp, and if using lines and a dock rather than driving the boat off the trailer, use TWO lines attached to different parts of the boat.
When I dock, I never rely on lines or people to stop the boat. I use the engine and steering. I generally approach the dock at a shallow angle (maybe 15 to 20 degrees) and have a person on the bow prepared with a line that's attached to a bow cleat and ready to use. Fenders are out and stern line is also secured to an aft cleat and ready to use. I'll come in at a slow speed (in and out of gear) and generally cover the the last 10-15 feet in neutral. A second or two before the person on the bow can reach out and get a loop of line over a piling, I crank the wheel hard over toward the dock and put the boat in reverse to halt forward motion and draw the stern toward the dock. If my forward line handler cannot get a loop over a piling in this situation, I abort and try again until the line can be secured. As soon as the boat stops, I put it in neutral. If I have another person on board, they will already be poised to tie off the stern. If not, I take care of it.
If it's windy, I try to tie up on the lee side of the dock so that the wind keeps the boat away from the dock. Once I have a bow line secured, I can use the engine and the bow line like a spring line to get the stern to the dock, regardless of how strong the wind is.
The most important tip for efficient pulling out is to not put the trailer in too deep. You need the boat to touch the trailer at the stern bunks/roller to keep it aligned. Once aligned winch it up. If winching gets too difficult, only then back the trailer in deeper and don't get crazy backing, a couple of feet makes a huge difference. Unless the ramp is entirely paved, and the local rules specifically allow it, NEVER use more than idle power to put the boat on the trailer. Doing so makes a big hole in the gravel off the end of the paved section of the ramp and doing that is very inconsiderate.
I prefer to drive the boat onto the trailer (again only at idle power) and think that's the best way to do it, but I see people successfully hand pull their boats to their trailers prior to winching and I guess if they can do it quickly and efficiently it's OK. That said, what's the point of having a motor boat if you are just going to drag it around with lines?