I've never done long distance hiking, but I have done some "long endurance" work cycles (21+ days living away from home) and I did learn a couple of things. Good socks are very important, high end wool socks are $$$ but stink less, dry fast and feel great.
When living on the same food for a long time, a little variety goes a long way to help the sanity. Even a couple of oreos, or something rationed out breaks up the monotony if you are otherwise eating the same stuff every day. (also, little sauce packets are great to change things up a bit) I lived off cous-cous, canned tuna and veggies for a couple months while working in the north as the camp food did not agree at all with my digestion (way too processed, caused major IBS troubles) and eating the same thing every day gets old, very fast.
With that said, also give your planned trail food a try before you go, just to make sure there isn't anything weird when you change your diet.
the only other thing I can think of, is do a really good gear shakedown, get very familiar with all the features of your gear and its operation. Make sure your pack fits perfect, and don't leave anything as a "good enough" fix it up at home, once you have your gear load, unpack and re-pack your bag a few times, you might find ways to streamline it, or "prioritize" your pack so you can get the things you want in the order you'll want them.
Depending on the mileage you are doing, you might want to plan for worn out shoes as well.
Again, none of this is thru-hike experience, just living out of a duffel bag in a truck cab for two months experience. but I figure, wilderness is wilderness no matter how you spend your time.