I'm guessing it's pretty much exactly the same as lowering them on an '05, and mine was very easy. I used this guide here: S197 Ford Mustang Lowering Spring Install - Ford Mustang | StangNet.com
Couple things to note though, when removing the rear shock bolts (Step 4) I had my car suspended by the frame and I used a floor jack to lift up the axle and relieve some of the pressure. It made removing the bolts much easier.
The other thing is that if you reuse your old bolts (especially the stabilizer link nuts in step 12) use locktite on them when putting them back in, otherwise they can come loose easily and it's annoying to have to re-tighten them.
Couple things to note though, when removing the rear shock bolts (Step 4) I had my car suspended by the frame and I used a floor jack to lift up the axle and relieve some of the pressure. It made removing the bolts much easier.
The other thing is that if you reuse your old bolts (especially the stabilizer link nuts in step 12) use locktite on them when putting them back in, otherwise they can come loose easily and it's annoying to have to re-tighten them.
