Sounds like a good idea if you can pay the bills doing it. Just remember, this is Kalifornia where the business climate isn't necessarily in favor of the little guy!
Legally you'll need a business license to do biz in each city. It's not much but it all adds up if your working in multiple cities. You'll need one in the County as well...they want their tax dollars too. I would start there to find out what credentials they want in order to give you a license. Some may just want your cash and nothing else. Some might require proof of insurance, liabilty and/or worker's comp, if no employees you'll be exempt from W/C. Some may want a Contractors License which you'll need to explore what classification you fit in, I'd guess pest control even if you're not spraying like a bug man. Check with the Contractor's State License Board there in Sac, they can probably narrow down what classification you fit in if any. It would be great if you didn't!
Maybe you can be like that Gator grabbin' dude in Florida that I see on all the Animal Planet shows....Pesky Critters I think he's called. He drives that Dodge 4x4 with the lettering all over the truck and goes swimming with Gators!