If you buy a complete kit with battery tray and all associated wiring then it’s definitely doable at home. If you don’t know your way around a soldering iron, leave it to the pros Wiring a winch in is not overly difficult, but if you have to remove your front bar, expect to wrestle with it for the best part of a day. The time might be better spent elsewhere while a workshop handles it
If you can read a wiring diagram and know how to drive a soldering iron then go for it! There are a few different types of management systems, from marine switches to DC-DC chargers, so do your research. Also, keep in mind that batteries are fairly large so make sure you have enough real estate set aside for it