You need to be very careful when replacing springs.
When you use spring compressors it would help to
have an impact wrench. If not you will be doing a
lot of ratcheting. Compressed springs are like a gun
cocked waiting to go off.
Here is when I went from a 2'' lift to a 4'' lift.
Done the front one day then the rear the next
day by myself. (I think around 2007 maybe)