There are several ways to get ready for NaNo and since this year it starts on a weekend - do yourself a favor - clean the house, do your laundry, get your desk/writing area ready today. Tomorrow, go grocery shopping, cook meals for the next few days, so all you have to do Saturday is shower and write (no, you don't have to shower until you hit the first 1,667).
Make sure you know your characters. At least well enough that they help you write the story a bit. Some times they change up on you in the middle of the story, but when you're working on a time crunch like this, it makes it smoother if you know your characters as much as possible.
If you write with an outline, have that ready. If you don't normally have an outline, it wouldn't hurt to have a loose one handy in case you get stuck. NaNoWriMo has been known to throw curve balls and leave people plot bunniless (is that a word? It is now.). And those of you (us) who stick to a tight outline. Don't be afraid to color outside of the lines. Some of my better scenes were written because of challenges given by MLs.
And there's another tip to NaNo, get on the site and find your region and attend a write in that is in your area. They really help shake the cob webs loose in the middle of the month when writing 1,667 words a day starts to wear on you.
Also, since it starts this weekend, take advantage of the that and try to get ahead so if works or kids or life gets in the way this week, you won't be that behind.
I found an article with tips and last minute checklists that will hopefully help with a smooth start to NaNo 2014:
NaNoWriMo: Quick Preparation Tips and Resources
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