Oh I did mine like 3 years ago, at 80K miles. Only broke 2 plugs- one broke coming out, and the one the hex spun off of actually didn't break but I had to break it off to get it out with the Lisle tool. Wasn't too bad at all.
I worked on mine over the span of 3-4 days. The one the hex spun off of, there was no way of getting it out without breaking it. The other one just got stuck. All the others came out great though. What can you do