Definitely not one of the easiest tasks out there, but feasible for the determined. I buttoned things up, fresh toyota long-life coolant, new rad cap, and lubed the sway bar bushings(urethane). Its like a different machine after resealing the intake and injection system. The truck has more power(quicker off lights, pulls better up hills, etc), idles smoother, and seems to shift through the auto trans smoother. It won't make your truck a rocket but for those out there with original seals, you might consider replacing them, asap. In the fall, I'll tackle the water pump and timing belt.
The worst part of the task is dealing with all the old connections. For those out there planning this job, some might be able to get away with reusing the holders. The ones on our truck were pretty brittle though. I'm looking foward to checking the mpg to see if there is any improvement.
regards