some hold the right needle in the crook of the underarm, and some use a sheath..
with the sheath --a sort of harness/belt worn on the waist the harnes hold an LONG metal 'straw' (think of hollow drinking straw)
the straw is flexible
the needle goes into straw, and is held by straw. (the hands steady it, as does the knitting!
you can look up knitting sheaths, (aka scots style knitting)
you are not alone.. Whole countries knit like you!