Worst part of that install is getting the current rear shocks off. I suggest cutting the shocks off just below the upper mount. Some guys have luck unbolting the lower mount, holding the upper nut and turning the entire shock. But my experience is that you are going to trash the shock doing that, so might as well just cut the thing. I haven't done one in a few years, but if memory serves me correctly the easiest tool given the space you have to work in is a Sawzall.
I'd also suggest soaking any nut/bolt you need to get off in PB Blaster or equivalent for several days.
+1 one to having a shop compress the front coils. And make darn sure when you take the old shocks off the front you don't remove the center nut until the spring is compressed.
For others ordering from Steve at Sonoran, I think he will assemble the front shocks/coils for $50--which money well spent.
Pretty good set of pictures for the 3rd gen here:
http://www.parksoffroad.com/tacomamods/4runner/4runnerlift/4runnerlift.htm