It is tricky to keep the ink from smearing. Two points are to make sure your acetate doesn't slide. I usually tape mine down to a piece of paper. The second thing is to have a steady hand and apply firmly, but not too much or the stamp will smoosh(is that a word?

) down and make the image fuzzy. Also, make sure ther isn't too much ink on your stamp or it will also smear.
HTH. Good luck. Let us know how it goes.
Ronda