I'm making the magknits Sharon of Rose hat.. I've done two crown decreasing rows, but I'm afraid if I go any further my circular needle will be too long.. how do I overcome this?
Then you switch to dpn's. I asked the same question about a year ago !
Or you can use the circular in a half magic loop - move your stitches towards the left needle, and take the right one and knit with it, making sure you snug up the yarn from the stitches on the cable.