You need to start investing in tools, books, and research time if you want to continue running that jeep without paying stupid amounts of money for general upkeep.
It takes 3 socket sizes including the 3/4" for removing the tire to change a unit bearing.
3/4" tire
36 mm, bearing retainer nut
13mm (12point), brake caliper and bearing bolts
With 35" tires you will be required to change unit bearings, balljoints, brakes, and some steering components on a regular basis. A TJ axle is not designed for a 35 inch tire. The additional stress means faster wear on parts.
If you rely on a shop to do this for you, it will get expensive.
Selectable hubs are cheap to service, but require a lot more attention.
If you dont mind spending the money, then go ahead. If you want to learn to do this stuff yourself, you can always come here and get help on any project you start.
good luck