First off, you obviously live in an area where freezing isn't a concern. :)
You don't want to start mucking around without some basic understanding of what's going on there, so asking questions is good. Working with a local well guy would be far better.
The well pump is dangling, but not from the cover. There's usually a pin/hook inside the well casing from which a chain is hung. If your well is really 1500 feet deep, it will likely mean using a which - I wouldn't want to raise or lower that much pipe by hand and if you slip you have a real problem.
There shouldn't be any wire splices inside the well. It should be one continuous power line to the pump. Furthermore, opening the cover means you need to sanitize the well before you close it up, so it's not something to do on a whim.
In general, I'd be a little concerned about the overall workmanship. It isn't customary to have the pump controllers and wiring just kind of hanging loose or dangling around the well. The water lines should be below the frost line all the way to the house and even if there's no danger of freezing, they should be buried enough that they won't get damaged mechanically.
At a minimum, all the electrical stuff should be in a weather proof box or pump house.