Ok, so i am wondering about the true difficulty of a drive install.  I have seen several people on youtube wrenching on their jeeps, and it doesnt look too overwhelming.  My fear is doing something slightly wrong and causing a catastrophic failure once i start driving (since i am not a mechanic).  I am reading some install directions and it seems do able. 
I am wondering about the axle drooping, and falling too far.  I have the floor jacks for the frame but do i control the axle with the floor jack?
The last thing i want is an axle across my forehead, that might impede my offroading.  
I am pretty handy and mechanical and have tinkered on cars and motorcycles most of my life, but have never taken on something detailed as a suspension.  
Thanks for the advice and honesty