How to Arm Knit a Cozy, Chunky Blanket

Measure 8 to 10 feet of wool. Create a slip knot by placing the tail end over the working yarn.

Slip one hand through the loop.

Using your hand in the loop, reach through to pull up the working yarn. (Note: Working yarn is the yarn connected to the source.)

Pull the working yarn through the loop.

Tighten until a slip knot forms.

To begin your blanket, cast on your first row of stitches. To do so, loop the tail ends of the slip knot around your opposite hand's index finger and thumb.

Slip your hand (holding the slip knot) under the loop made on your opposite hand's thumb.

Cast the stitch onto your hand; you have cast on your first stitch.

Cast the first few stitches onto your arm, using a loose tension and leaving wiggle room in each stitch.

Once your arm is full, gently slip stitches off and lay on your working surface. Continue to cast on until you have 13 stitches.

To knit the body of the blanket, pull a loop from the working yarn up through each stitch (this is emulating the knit stitch). 

On your first row, you'll work left to right; on your next row, you'll work right to left. (Note: Your cast-on stitches may appear to be laying on an angle. Always twist the stitch towards the right before knitting into them.)

Continue arm-knitting until you only have around 7 yards of wool left.

To finish your blanket, cast off to ensure that your stitches don't unravel. To do so, pull up loops into your first and second stitches as normal.

Take the second loop and insert it through the first loop. You have now cast off the first stitch.

Continue with all stitches by pulling up a loop on the next stitch, and then pulling it through the previous stitch. At the end of your last row, cut tail and pull through final loop; discretely weave end into backside of blanket.