This is available as an instructables tutorial. The instructions can be used to knit either an adult sized mitten or a 2” wide decorative mitten.

It is formatted in steps, and you can choose to view all steps so that the instructions are all on the screen at once. It includes some videos to demonstrate how to work Latvian braid, decreases, etc.

I used fingering weight on 2.25mm needles for the mini mitten and aran weight on 5.5mm needles for the adult size.