1. Wash diapers/fabric and dry to be sure nothing will shrink. That way, your design will stay put.
3. Place your stencil. Secure stencil with tape. On my second diaper, I actually took a pen and traced the stencil on the diaper, removed the stencil plastic after tracing and then painted from the pen marks. That seemed to work okay too. I found that if you don't have the stencil flush against the diaper, the paint bleeds underneath the stencil lines and your shape kind of globs together underneath the stencil plastic if you are not careful. My first diaper did, but not enough for me to really tell or care.