Knit two at a time, similar to method used with socks. After knitting about a half-dozen rows, reduced down through most of the wrist (K4 reduced to K3), then increased a few near the thumb gusset.
Really like how this thumb gusset is shaped, concerned at this point that the thumb portion of the pattern is a bit short for my hands.
Overall hand length is a bit shorter than I prefer, if I did it again would knit about 4 more rows in pattern. A smidge tight in the hands, probably shouldn’t have re-reduced. Still look nice, mostly pretty comfy.