I got my Swift Spec-R's and Bilstein B8's installed last weekend. I spent most of the day working on it, probably close to 8 hours total. (I also cleaned and sealed the wheels and calipers.) I was able to do it myself, I'm not sure a second person would have helped much, unless they were working in parallel. I bought them used so they should be broken in a little already. I also installed SPC camber bolts on the upper front strut bolt and set the camber to the most negative camber I could get.
My first impression is they really make a big difference in the "control". It felt like everything rides smoother, and there is less roll and compression feeling in the corners. I think the combination of the stiffer springs, with the upgraded shocks, the lighter wheels, and larger sidewall on the tires is a great combo. It just looks better now too, lower and less wheel gap.
Before and After Pic:
I took it for a quick 10 mile test drive after the install and it probably settled a quarter of an inch.
I think the last suspension upgrade is probably going to be a 2 or 4 point front brace.