Now you it’s time to basically sit back and watch this grow. The sides and bottom of the slipper sort of grow out of the bit on the back.
There’s a stage there in the middle where it looks a little menacing (lots of needles because the fabric is U-shaped, even though you’re knitting flat…if you were less stubborn than me and used circular needles it would be less prickly at this stage).
But after a while things calm down and you just knit and knit and knit until the slipper gets close to where you want it to join up on the top of your foot, at which point you sneak in a few decrease.
Now, for the big footed among us (raises hand…me…that’s totally me), this may take a bit longer than you’d like. But it will eventually happen.