Instructions about using variegated yarn:

I started crochet every piece with new ball of yarn (2 balls needed).
This is very important if you wish your color parts of both slippers goes on the same way.

If you crochet about yourself, you can try on slippers and their widht and lenght.

Gauge isn’t too important. If your gauge is a little bit big that just means that there will be a bit of growing room in the slippers.

But you can test until you crochet them.