I had a probably too long reply typed out and somehow inadvertently deleted it. So I'll just say I've carried AIWB for a long time before it became the in thing to do. I've carried numerous size and brands of pistols and revolvers AIWB. Glocks of all sizes some with lights and RMR's, Hi-powers, 1911's, CZ's including a Shadow 2, J frames, K frames, L frames, N frames, Ruger SP01's.
When I do carry a revolver now it's a 3" 686+ (Sometimes a 4" and I'm thinking about going to a 3" or 4" N frame) AIWB in a Garret Industries Silent Thunder AIWB holster. It's a kydex holster lined with soft leather and it's been one of my favorite holsters of all time. I used to modify holsters all the time to get something that would work better but with AIWB getting as popular as it is it's much easier to find holsters than it used to be for a revolver, although there is still room for a better selection.
Maybe it's because I've done it for so long or maybe because of all the little tricks I learned along the way, but I think carrying a revolver AIWB is pretty easy duty, and of all the guns that could be carried that way a revolver is probably the safest.
AIWB is probably easier for taller thinner guys but I'm 6' 235 lbs and don't have a problem with it. I truly believe it's as much mental as It is physical.