I've been carrying concealed for the better part of two decades now, so I have some thoughts on this matter... First of all, I like holsters from Dale Fricke and Blade-Tech. WOTG (Frank Proctor) also has a new holster out now that looks interesting. When you invest in the holster, invest in a good gun belt. I usually wear a Wilderness Tactical 5-Stitch Instructor belt, but I also own nice leather gun belts. Expect the belt to cost as much as the holster.
As far as where and how to carry, I am a big fan of appendix IWB carry. As long as you utilize a holster that securely covers the trigger guard, the gun is not going to go off. Re-holstering concerns can be mitigated by looking at the holster as your re-holster and doing so slowly. No need to speed re-holster... With those common safety concerns out of the way, I would posit that AIWB is one of the most concealable methods of carry that also arguably offers the fastest draw. Regardless of whether you are sitting in your car, on your back on the ground in a fight, or need to access the pistol with your off hand, you can draw your gun. You draw your gun covertly if needed, as the motion telegraphs far less than if you carry behind the hip. You can more easily retain your gun in the holster in a fight, and you can brush up against people in crowded places without them bumping into your pistol. If somebody feels your pistol when you are carrying AIWB, then you should probably know them pretty well! You can bend over to get something on the bottom shelf in the grocery store without printing or exposing your holster and freaking out the soccer moms that demand action! For me, there are just too many reasons to carry AIWB and too few to not. The caveat is of course that you must wear an untucked shirt, unless of course you choose to use a tuckable holster... Also, it helps to not have a gut hanging over the belt line. These days, most holster manufacturers offer an AIWB specific holster, or one that will work. I usually choose a full holster and reserve the minimalist holsters such as the Vanguard mentioned above for more discreet NPE settings. In that regard, I suspect that you will find that your G42 virtually disappears carried AIWB in a minimalist holster.
Hope this helps...
