Need an extra set of hands while stenciling? Try some magnets! Can be used while either airbrushing or scraping with icing.
 
Sold by the dozen, these 1/2" magnets are the perfect size for using with stencils. Place 2 under your stencil and one on top at the 4 corners of your stencil to hold it in place. Work on a magnetized cookie sheet to really hold everything in place! 
 
You can see this technique in action in this YouTube video.