I love the occasional winter solo backpacking trip myself - it will be a great adventure for you!
All the advice given above is excellent. Definitely do some shorter practise trips to test everything first - get all potential blistering/chafing/uneven weight distribution issues out of the way.
Also, no matter how well you stuff everything into your backpack, after the first night everything seems to expand and NEVER goes back in the way it did when you packed it at home. ALWAYS happens to me.
For food, be sure to bring treats, whatever your favourite indulgences are. It will be something to enjoy at night, warm in your sleeping bag, after a day eating trail mix and dinner of rehydrated Chicken Teriyaki eaten from the bag. Eating the same food day after day gets boring very quickly.
For a New Year's trip my treat was a bottle of champagne. Well worth carrying the weight!