I was totally nervous. I'm still working out some bugs, but the truck was designed and built by some very capable folks at Iron Pig. So while, there still are a few gotchas remaining, the best thing to do (if not doing it yourself) is go with a shop that has a reputation for quality builds and use the boards for advice (T4R, 120, MUD, TTORA, Pirate, Yotatech, etc).
I'm waiting on a new Inchworm transfer case to make my truck part time 4wd (and probably a double cardan front drive shaft), so I'm not driving it much due to a front driveshaft vibration.