See, none of those shaving tips will work if he's got hairy legs. His goal would be (and this is what I gathered from his first post) to trim his bush as much as possible so that it looks normal but not like a forest. With the exception of his nutsack I wouldn't really shave everything completely otherwise it'll look very weird when you look at the whole picture (crotch + butt + legs).
Of course, it totally depends on what he looks like. Since I haven't seen him naked, I have no idea what to say other than what I already said.
Though, if that's not a problem, then yet, non-abrasive cream + Gilette Mach 3 would work great actually.