I've not done a Hiace have a Townace, it is much the same not difficult, just awkward to get so some of the bolts once a whole load of pipes have been moved out of the way.
I've only a standard socket set and spanners. I had to buy a universal joint for the socket set to get to exhaust nuts. Already had a torque wrench for putting back together.
Click on the link to the on-line engine manual, and let your friend have a read as it details it step by step.