Removing and Installing rear shocks is easy if you know the tricks.
You will need a 15mm socket (preferably on an impact) and an 18mm open end wrench. Start with the lower bolt on the axle, remove the nut and use the impact to run the bolt out. Then remove the top nut, slide the bolt out while holding the shock… easy!
The easiest way we have found for installing rear shocks is to use a bottle jack and a wood block to lower the spring to line up the bottom bolt. Start by putting the shock in place and installing the top bolt, do not tighten it down yet. Use the bottle jack sitting on the leaf spring to lower the spring until the bottom bolt lines up, install then put the nuts on and torque to 66 foot pounds.