The Patchsmith answered:
I didn't find it too difficult - I stitched it using a blanket stitch on my sewing machine. However, it would also work very well if you were hand stitching. And, if you find it intimidating then I would recommend hand stitching the notes in place - you have more control over the stitching and where you place them. If I can help in any way, not just for my patterns but for anything to do with mug rugs, applique and patchwork then feel free to email me at firstname.lastname@example.org.