I needed to make one between the sizes of 18-21 inches, so I used a 1.80mm hook and it came out perfectly! This is also the first time I’ve pin-blocked a doily. I first pinned the tips of the inner pineapples, then the tips of the outer pineapples, then each picot around. I steam blocked with an iron. If you click on the blog post linked to this project, you can see that I created a photo-tutorial of each round (all 36) of this pattern if you need help with it.

Here is the photo-tutorial of each round:
http://www.emilyandthe.com/double-pineapple-doily