It is just an opinion, but coming from a region that has poisonous snakes and spiders and a few other nasty's in that garden- I have gotten so I will usually try to stir an area up a bit. You can mist with a hose, or let the dog roam around a bit. I think it is pretty dangerous to walk up to a dense planted area and just dig in. I have watched trained landscapers come to work and get chased out by hornets that were not there a few days before. I never ever just plunge my arms or hands in without checking what might be in the plants. Just take the spade and move the plant leaves a bit.
Although we have snakes I have never had a problem with them. I have had snakes slither by while I was working or just looking at an area. I like the way they drape themselves on the sticks for heat. It seems they like to go in the bricks under my raised beds. I just leave them alone, and usually they stay away from the dog. I have found that if it is cold the snakes will crawl into a bag of mulch if they can to escape the cold, so be aware.
The spiders though, because we have wood chips and stacked fire wood, I am always watching for the Brown Recluse Spider, in all sincerity though, I have seen a few very large common garden spiders I would not want to be bit by. We have some sort of scary looking black fuzzy spider, I swear it looks like a tarantula, which we do not have this far north, but still I would not want that thing to bite me. I have no doubt it would hurt.