The second phase is the actual writing process. And like I mentioned, it is great just to be able to sit down at a keyboard, and not have to worry about coming up with an idea. You already have your idea, you already have your notes, you already have your structure. You pull those up from your planning session, and then you simply get down to writing. Then the key with this is, you know, what the plan is, and you start writing, and then you just don't stop writing. I know this sounds really simple, really obvious, but a lot of people get caught up with trying to either reject the plan, which can work if it's a small, small tweak, or worse they get into editing mode.
This is where you see people do this a lot and I used to do it to invite a sentence are us no good. So you rewrite the sentence are maybe this needs to go here. You spend all this time rewriting the never end up writing anything. So this is important. Give yourself the freedom. Just be able to write to do nothing but writing.
Then when you're done, you can put the writing aside at a future time. Come back to phase three of the three phase system.