it’s always a good idea… i learned the hard way…
Skein of yarn from the store… 1/2 way into a sock, at a part where i wouldn’t be able to cut yarn and join new…
The yarn changed. went from being sport weight down to being twisted so tight it resembled size 10 crochet thread… I called the company that made the yarn, they sent me a SASE for the 6 foot length that was inconsistent with the rest of the skein…
and sent me 3 skeins of that yarn in that dye lot.
Now see, had i wound it BEFORE attempting to knit with it, i’d have known about the bad section before working on the sock and the pair wouldn’t have sat in my UFO pile (naturally it was the second sock this occured on) for a year.