Yep, that's what I'd suggest. Knit flat for a few rows rows, enough to be able to join easier. with fine yarn that may be 3 or 4 rows. Then lay it out flat on a floor or table with the working yarn coming from the needle on the right and straighten out the stitches. You may need to put something on one end or get help to hold the needle down. Then pick up the ends and join.