He is just stressed. Try moving him to a place that has less foot traffic. A room that is hardly used. Also place more hides in his cage if more will fit. You can make temporary ones out of boxes. By the sound of things it seems you have had him for less then a day. It is pretty common for a new snake to strike out. I would not cover then entire cage with construction paper honestly. He does need to get used to the fact that the front will be open for view. Do not try to hold him for two weeks. Feed him on Sunday then again next Sunday and 48hrs after that you can try to hold him. Best thing to do if he is still snappy is to not hesitate. Do not give him a chance to fixate on his target.