I usually use short lengths of yarn and tie the top of the sleeve to my shoulder seam, the bottom of the sleeve to the underarms of the sweater, and a few places in between.
I do start sewing at the top and working my way down, just in case there's some unevenness so it can be hidden under the arm.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry