Mmm - let me see...
The first thing is to tell everyone that you're doing it. Then tell them how far along you are. Make your colleagues / friends ask you how it's going.
Tell your family that you must do your word count every day, and mean it. Explain to visiting relatives that they can come and visit in November, but they will need to occupy themselves for a morning while you write.
I have a spreadsheet where I record target word counts and actual word counts. Then I record word counts in the Nanowrimo online counter and watch my graph of numbers curve up steadily.
When you get stuck, ask yourself 'what's the worst thing that could happen to these people at this moment?' and then have that happen. You can keep going for ages like that.
'Write or die' is a wonderful online tool for overcoming the tendency to procrastination. Sit down, tell it you want to write for 30 mins, say, and then get on with it.
Mark out key moment (e.g. 25% done, 50% done, 75% done) and celebrate them with cake and wine.
Accept that the house will be messier for the duration of November, and that meals will consist of more beans on toast than usual. That's fine.
Plan a party for December! Tell everyone why you're celebrating and make them drink a toast to your success.
And finally - this is a draft. It doesn't have to be well written, or have a plot that hangs together entirely, or have consistent characters. The aim (for me at least) is to get a sizeable first draft of a novel down on paper, ready to improve over the rest of the year.
HTH!