Cannot answer your question about unhooking. As for backing up, go to an empty parking lot to practice. Place your hand on the bottom of the steering wheel and which ever direction you want the trailer to go is the direction you move your hand. I spent hours learning to back all sorts of trailers--boat, 30 foot TT, u-haul trailers from 4x6 to 6x12. The key is lots of practice and to remain calm and not get cocky. Every trailer one backs up will "kick" differently so don't get frustrated. Also, no more than 1 hour at a time, or you will get tired and what headway you made will be lost. 3-4 days of that and you should be feeling more comfortable and be ready to practice putting it between the lines on the parking lot, or if no lines, blocks of wood.