I have pulled several submersible well pumps in my younger years, usually with a helper. A pump will weigh in the vicinity of 25 lbs. The Pitless adapter and pipe standoffs will weigh a few pounds and the poly pipe + 10/3G pump cable will weigh about 0.64 lbs per ft. Therefore, at 160 ft., the whole thing will weigh roughly 130 lbs. As noted previously, you won't be lifting the full 130 lbs because of the buoyancy of the water. As you pull the pipe and lay it on the ground, you will be lifting less and less pipe as the pump comes up.
If you can get a hold of a roller guide (it clamps on the top of the well casing and has a roller guide on top), you could pull the pump yourself. It is a wet slimy job. You may need to install new pump cable or new standoffs with a new pump, depending on what you find when you pull the original. You will also need a new splice kit for the cable, with shrink tubes