It isn't too hard at all. One tip, use an impact wrench to take the nut off of the top of the strut when you cant use a wrench anymore. And, get a buddy or two to help put the strut back in place after the spacer is installed.
Just go to a shop and have them do the spacer install, less headache and a lot safer. Tyler (a.k.a. Showstop) helped me to install 2" spacers and it busted his Harbor Freight coil compressors. Having the shop to do it will probably cost about $30 per strut.
Does anyone know the part numbers of the Bilstein shocks that would be the replacement for the Rancho's on the lieblweb.com's 2.5" lift? I'm having a hard time figuring out which shocks are the correct fit. This is going on a 99 V6 TRD Xtracab.
I'm also still undecided if I should go for the 5100 or 5125's. I've also seen reference to some Bilstein-HD shocks -- what is the model number for these?