I grew up playing in San Diego hills and have seen a few. They tend to want to avoid us. It you're digging around in shit, wear leather gloves. Just a generally good idea. ..and not specifically for tarantulas (which are, while very creepy, fairly inocuous. My uncle was a high school biology teacher and he had one on a leash he would walk the halls with. Uncle Bob...he was very funny. :-))
At my convention (yes, for dentists - and don't gag. It's also how I lost time and energy for the selfie/story contest. ) I saw a classmate of mine who has a dental practice in Fallbrook. Very good guy, let me know if you need his info.