If only Knitpicks had interchangeable 2s and 3s, this wouldn't be an issue.... but ...
The owner of my LSS showed me how to do 2 socks on one circ (magic loop). The pattern she used to shw me was one that she had adapted from somewhere. The pattern starts out with #3 needles, and you do 3.5" for the cuff, then change to #2 needles.
Of course I'm home and it's time to change needles and the LYS isn't open until Tuesday. I have both socks on the #3 needle, and I have no clue how to move them to the #2.
This is my first pair of socks ever, and so I am tempted to just leave them on #3s for the entire thing since it's a learning exercise and I'm sure they will be unwearable anyway.
But really ... I should probably know the answer.