I will say, try some cheap yarn rather than one from their recommended list if you want to try knit or crochet breast forms for the first pair. If you end up not liking them, you’ve spent less on yarn, and cheap yarn is generally bigger than what they recommend, so it will take less rows and less time. I only crochet, so I’m not sure if you can do this with the knitted ones because they have a nipple, and you probably don’t want to look like your’re storing a peanut m&m in there 😆