Re: new to boating unloading and loading boat at the dock
Sounds like you are getting some good advice. Being "new" to boating, one thing that would really be appreciated by your fellow boaters (launch/loaders) is to ensure that you only use the launch for launching, keeping your launch time minimized, and if a double ramp, use only one side. Do your IN/OUT prep elsewhere. If you are launching in light traffic, it's not so important, but for Sunday outings, when the launch is busy, others may not thank you personally, but they appreciate it none the less.
On the launching angle you mentioned, would be nice if all boats interfaced the water the same and all launches were at the same angle in protected water. But things aren't that simple and you have to adapt. Having a pier or other place to tie off, without having to get in the mud or get wet, is really a plus.
On transverse waves that mess up your launching and loading trailer guides, either hand made out of pvc and a flag mount bolted to the trailer work well, or purchase aftermarket if the trailer doesn't come with them. Also I back my trailer just far enough in to get the transom to float, or when launching, as others mentioned, just have enough slack in your winch strap/cable to allow your boat to float off and pull up till you can get in without getting wet.
Having a pickup works very well for me when boating alone which I usually do. On reloading, I drive on and again, just back in far enough to ensure that I can drive the boat 90 % of the way on the trailer then turn off the engine and tilt it up then sit on the tailgate and finish off the last 10% with the winch.
Have fun.
Mark