Try to take a few longer routes to work here and there if you can. I plan on doing similar mileage and have barely put in any miles this year. Hoping to go in May. I have wanted to do this trip for 3 years now and am finally going to go - I can't wait. I agree that putting things off isn't the best option. With the Amtrak service there, I would leverage that. Take the train to the start and then if things don't work out - take the train the last bit home too. Gives you a good bail out option but you likely won't need it. In any case, only you can assess how likely you will be able to do the trip.