Well, for me, incredibly difficult.
The cast-on technique was easy enough and I started knitting my first row around the double pointed needles (DPN). Only when I reached the end of the row, I'd somehow ended up with a huge gap. I assumed that some stitches fell off the needles and I took everything apart and cast-on again. And yet again, everything looked right, but when I reached the end of the row, there was a gap. This one was smaller, but still a problem.
When I tried for the fourth time (Fourth time's the charm, right?) I made it around the row and it stayed the way it was supposed to. Hurrah!
Only I celebrated too early.
As I finished knitting row 2, I spotted a gap. I might have cursed. Profusely. I had no idea what I was doing wrong, but I ripped it out and cast-on again. And again. And again.
I'm not sure what I'm doing that gives me a gap when there's none in my cast-on, but apparently if I ever want to make socks, I better learn the magic loop method.