G.B.
You mentioned purging, and I'd take that pretty far. Unless you're a person who has a lot of attachments to things, sentimental or otherwise, I would really get rid of as much stuff as possible. Most people only use a small fraction of their belongings, and IMO, the rest is baggage in a major move like this. My family moved overseas last year and is now living in an apartment that's about 1/4 the size of our old house. We left behind a ton of stuff. I miss my friends but not really the stuff.
I'd also get myself off mailing lists for catalogs, etc. because we all get so much junk mail and it'll keep coming to your house forever unless you stop it.
Good luck with the move! Don't worry, you have plenty of time and it'll all get done.