hard top/soft top are interchangeable. If you buy a hardtop, most likely it will come with everything you need. The wiring dongle is probably already on your jeep and tucked away behind the rear passenger side (where the seat belt mechanism is). On the rear driver side, you will find the washer fluid connector. Super easy to connect/disconnect everything. Just use common sense as you go.
Look into a hoist system for your garage. Much easier on your back.