I've disconnected and rehitched a dozen times or more and this is what I do.
To un-hitch, after blocking wheels
1) run the jack down and raise up about a inch, loosen one of the tension nuts tell the chain is loose.
2) remove the pin under the ball and let the attached plate with chains fall to the ground.
3) unhook safety chains, trailer electrical plug, and emergency brake cable, hitch latch and raise trailer off the ball.
To Hook-up
1) lower trailer unto ball without any load on the tow vehicle, close hitch latch, install lower plate with chains and pin in place.
2) tighten the nut you loosened to it's predetermined position, (I have ours marked with paint)
3) lower trailer, connect safety chains and electrical plug, and emergency brake cable.
4) do a complete safety check not once but twice.
The marking of the tension nuts, after they have been properly set, is the critical component to future, easy, predictable, setups.