How did you feel 8 weeks into the plan (not counting the knee) ?
You have a good three months to work on a base before you would have to start training specifically for the marathon. As others have said, try to start running maybe 4 times a week, low miles though so you don't re injure the knee or anything else.
I had about 1.5 years of regular running before I started training. I seem to always be on the verge of injury.
I say go for it! Misery loves company
I was following the plan, and doing a good job. Probably made 95% of the runs in the 18 week program. I did the 12-week Pre-Marathon training (Spring Training), and the first 10 weeks of the Marathon training.
I think I was on track to make it, slow albeit, but make it. I tore my meniscus tripping on a rock running about 5 miles from my hotel. Not happy about that one. It was 2 weeks before I got back to the US and had a chance to see my ortho. He is a runner, and said time to fix it, and to forget about 2011.
Anyhow, today, my right knee is VERY loose, and unstable. The rest of my body is a little sore, but nothing major. I figure give my knee 2-3 days rest, and then I'll try a slow two-miler. If all goes well, I'll go bak to running 2 every other day, and throw some quick mile runs in between when I have time. In a week or so, start to extend the distance 2 runs per week.
If that goes well, I'll hop back on the Higdon program, and start to follow that religiously. I don't expect to make it through, but at least I'll give it a shot.
It amazes me how many people run, and how well they run. Looking at the miles that you guys pile up is just amazing to me. And the PACE that you run, doesn't even compute. I can imagine getting to sub-9 perhaps for a 5k if I run a ton, and for a long training period. But the times and the speeds that many of these people run... all I want to do is FINISH the events, at a good pace for ME. That is fulfillment enough.