I think you might be better off selling your auto-trans Jeep & using the cash to find a Jeep with a 5spd.
1.Autos are popular now & would probably sell relatively easy.
2. There's a lot more to than the transmission to change(brake & clutch pedals,clutch linkage etc...) you don't say what year or model of Jeep you're working with,but there is likely electronics involved.
Let us know what you decide & how it works out if you decide to go ahead & make the swap.