I ran into a big Yellow Jacket nest a couple of months ago in an attic buried under a foot or so of blown in FG Insulation, luckily I hat e Fiberglass and had on my Tyvek suit, a resprator and goggles, they got me pretty good on one cheek, my neck, and my ears, quite a few of them followed me into the house before I could get the access cover back in place, and again luckily the house was vacant and the only other person there was a Realtor who got zapped a couple of times, I think in the summer I will start wearing Tyvek suit with hoods.