Yes, you are. Clean, isolate and sanitize before and after (just like you should with any brew recipe or yeast). Surfaces, tools, funnels, fermenters, etc. Just use common sense.
You can also spray some Lysol (or similar) on and around your work area if it makes you feel better. It is a bacteria killer. Beyond the brett, what wild yeast or bacteria has been floating around your brewing area? How would you protect your brews from infection brought in by a common house fly or airborne spores? Simple good hygiene practices will suffice.