If it seems daunting, why not give yourself permission to take it off the "bucket list"? Setting an extreme goal like riding coast to coast might suck all the fun out of it. What if you don't make it all the way for whatever reason. Will you be obsessed over the failure? Bicycle touring is not an extreme sport!
What if you start out with the idea of going as far as you can or as far as you feel like? Go as slow or as fast as you want. Don't over plan. Stop if and when you feel like it. Take a nap. Relax. You might end up riding all the way and feel like riding back too. You might go two or three weeks and decide to pick it up again next year. Who cares? What if you did it in two or three week chunks, coming back to the business and family and doing another two or three week chunk the next year. Touring should be relaxing and you should have a great time. I give you my permission!