I'm going to participate too. I haven't written a novel yet and this is my first time doing NaNoWriMo, so I can't give any advice on doing a 50 000 words draft in a month, but here are some general writing advice I learned from a writing group I'm part of.
Plan out some time to write. You shouldn't hope to fit time to write according to all the other things you have to do, but rather you should make some time to write. I mean, if you don't prioritize your writing, then you probably won't have time to do a 50 000 word novel.
Cut out distractions. There are some internet/app blocking application out there if some of you need them.
Get yourself accountable. Just ask your family, your friends or a writing buddy out there to make sure you are writing.
If you are doing your first draft, just turn off your inner editor (as they call it), and just write. You can edit after you finish (or it else it might get in the way of your writing speed while you want to get as many words as you can in a month of time instead).
(And actually, a secret(maybe?) knowledge: if you feel like your writing is not good enough and feel stuck about it, it just means that you have potential to do better, so you have "good taste", as our instructor says. It's just that there is a gap between your potential and your current abilities. But then again, to close up that gap you have to practice yourself by writing a lot, so if you don't write, how will you improve? )
While I say all of this, I still need to work on many of those points myself (I might have written this partly for myself. Haha). Anyway, credits to my writing group, the "Young Writers Workshop" and its instructors. I guess that's all for now.
By the way, I could use an accountability partner if someone is interested?