PATTERN NOTES/SUGGESTIONS:
Depending on how you prefer to wear your shawl (more fitted or larger like a wrap) will determine your foundation chain length.
I would categorize this shawl in a medium size.
The main thing is to keep the correct multiples. For this stitch, you will need to maintain a multiple of 8 + 2

How to have success while making The Lacy Shawl
The key to lace crochet stitches is blocking. If you want the stitches to really stand out, it is important that you block them.
If you are struggling with the written version of this pattern there is a full video tutorial explaining every step of the stitch.