Locking to the Side of the Stencils

[IvyLeaf]

New to the forums. I did a search and did not find an answer to this so if this is a repeat quest - forgive me and send me to the answer.

Is there a way to lock the pen/brush/etc to the edge of a stencil (such as a French curve or circle) to create a smooth curve/line?

My hand is not steady. I do use a pen tablet, but I have a small tremor and my lines/curves end up extremely "rough."

Thank you for your help.

Kathy