I had some, but didn't need them, there's no need for the 1*2's as they're not under compression once off the car really.
The rear springs took about 3-4 mins per side. Literally, jack rear up, undo a bolt, pull spring out, put new spring in, do bolt back up.
The fronts took about 20 mins each side. The hardest part was getting the nut on the top of the shock undone. Needed an electric power thingy so it span in quickly, otherwise the shock can just spin and it won't undo.