I see this question has been here a while but, in case you never got an answer, I recently installed Western Chassis 2" drop coils in my '05 and it was dead simple. With the front on stands, and placing a floor jack under the lower control arm, disconnecting the sway bar end link and tie rod end, and removing the brake caliper and ABS sensor, I then removed the clamp bolt that holds the spindle to the upper ball joint. I was pleasantly surprised at how easily the ball joint stud separated from the spindle. In my youth I disassembled plenty of 60's and 70's GM cars to change coils or convert to disc brakes. Separating the ball joints from the spindle was always the trickiest part. Anyway, all that was left was to lower the jack and gently pry the spring loose, allowing it to simply drop out onto the driveway.
Obviously, installation of the replacement coils was even easier due to their shorter overall length. The whole job took less than 2 hours for both sides with the second sie going much faster, of course.