Beth, you are not going to know if the stencil is the right size till you try( use scrap paper)
I did two yesterday that are terrible. I did three and deceived to try the leaf one again and again.
The holes seems the right size, then it was finding the correct stamps. By far the peg stamps work best.
I suppose you could make some shapes that were tiny out of fun foam and put them on a block making your own peg stamps.