I love making FG blocks, no idea why. These finish 1 1/2 x 3. Yes small and will be using them in my rail fence quilt. First hint is to cut accurately. I have to cuz these are smaller than I usually make. Second is to sew slowly. Again I have to because of the size.
Lots of links on line. Here's one with cutting chart, various sizes.
https://www.modernlymorgan.com/four-...eese-tutorial/