Some helpful tips. When dropping the implement put the tractor in neutral and let it roll to level ground so unhooking and hooking up is easier. Also try to get it in a strait line when unhooking so your arms line up.
Personally, I put the tractor in neutral and leave it running so if you have to pick the arms up or adjust the implement you won't have to start it again.
Guess that comes from me changing out implements by myself though.