If this is your first time around, I suggest you make this week count as much as possible. Circumstances differ, but I learned my first time around that aiming to get a little ahead the first week didn't hurt. Just stick to your plan and get as close to your daily and weekly goals as possible. Life will happen during NaNoWriMo but don't get discouraged. Just keep trucking.
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Don't get stuck trying to make everything perfect. I loosened up as time went on but I found the first few days tough in that regard. I thought too much and wrote too little. Just relax and write. It's a first draft after all and isn't supposed to be perfect. You'll have plenty of time to revise after November.
Photo by seyed mostafa zamani