If you're anything like me being in public and sketching is not your idea of fun. You know getting out and sketching a variety of things is good for your muse and skill, but it also makes you break out in a cold sweat. Been there and still do that! Here are some tips I've learned to keep the anxiety away and the muse on my shoulder:
Find a hiding spot.
Sketch from inside your car in a parking lot, from a back booth at a coffee shop, under a tree at the park, anywhere that keeps you from the main focus.
Find busy people.
Sketch while others are busy drinking, cooking, playing, and talking. They won't be paying attention to you.
Babies are great.
Sketching babies are great because they don't care about what you are doing. Take advantage of this age by sketching at the doctor's office or at the park.