Get one end up in the air with jack stands under the frame. I doubled up the jack stands just to be safe. At that point you only need one good floor jack to lift an axle end off the spring.
If you've got a good kit, it goes in pretty easy.
I recommend ALL new fasteners, which you will want to source before you begin. You won't find it on a weekend around town.
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,GM HEI Ign, 5 Speed Peugeot, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.