O if only in life you could rip back. But fortunately in knitting when you make a mistake you can.
Yes its true my second sock is still not done. I have ripped back on this sock three times. I used the leftover yarn of the first sock to start the second sock and joining the new ball of yarn has proved problematic.
If I get the join right then my stitches turn out too lose around it. This is the third time, hopefully I get it right.