tl;dr - Instructions how to tether via USB without using MyTether.

I know that there are instructions on this forum on how to do this because I did it myself before I installed Mobile Hot Spot, but I can't find any newbie friendly, step-by-step directions to give my brother that don't involve MyTether. If anyone knows which thread it's in (or more helpful, which post. Reading 38 pages of threads is never fun) that would be extremely helpful.