Cricut Stickers - Custom Cut Files - With Adobe Illustrator

Thank you to Mark's World for making this video!!
From his YouTube description:
Ok Cricuteers, here is a very helpful tutorial on using Adobe Illustrator to create custom cut files for your planner book sticker sheets and other general purpose images. Have you downloaded an 8.5x11 inch PDF with sticker photos but have no cut file to go with it? Fear not! Here we go through all the steps in creating your own cut file. Then all you have to do is print your PDF as usual on your inkjet printer, then cut the stickers with your Cricut Explore Air.