Signing a form in Reader DC

I'm creating forms that need signature, and I'm looking for suggestions on how to make the process easy for users. I don't need official digital signatures so I don't want a true digital signature form field that requires setting up an identity. 

I want the user to click on "Fill & Sign"

then click the Sign button.

and draw their signature.

I don't want to clutter the forms with lengthy instructions on what they need to do to sign, or to have to refer them to a separate instruction sheet.

Does anyone have suggestions on how to make it easy for newbie form users to draw their signature without cluttering the form with instructions?