Gauge is 10 stitches in 2cm & 12 in 1 inch on #000 with lace weight yarn.

You will need to know how to work the kitchener stitch. If you do not here is a link with written instrcutions which you can keep handy. But there are plenty of videos available if you need to see.

One note: Take a couple of small stitches at the bottom of the sleeve to complete and tighten those. Just looks nicer.