Well, if you have air tools and have done this a bunch of times, you probably could knock it out in an hour. It took me a lot longer.
Put the whole car up on jack stands with the rear axle not supported by the jack stands.
Remove the rear sway bar.
On one side, loosen the lower control arm to axle bolt, and then jack it up a little with the jack under the control arm to allow you to remove the bolt. Then slowly lower the control arm with the jack. The spring will decompress and fall out. Replace with the new spring, jack it up, and here's the hard part - get the bolt back in.
For the front, remove the front sway bar and put the jacks closer to the middle of the K member so you aren't supporting the car near the A arms. Remove the 2 nuts on the A arm to K member bolts
Place the floor jack on the A arm between the two bolts that attach the A arm to the K member. jack it up until one loosens - usually the back one, and then use a bottle jack and a pry bar to jiggle the front one out.
Once both are out, lower the jack and the spring will decompress vertically completely.
Swing the a arm backwards and the spring will fall out.
Replace with the new one, just do the reverse to install.
The front method is written up by MFE on corral but that is the jist of it.
Good luck - I just did my springs struts and shocks (do not lower your car without new struts and shocks) and rear LCAs and UCAs
