Is it going to be the end of the world if you have to bail out? If not go for it. I did a shorter trip last summer and got pretty beat up but had a great time. I did not have time for much conditioning or any kind of shake down ride, so there was a lot of on the job training. I do have a history of previous endeavors that let me push forward with a "wouldn't be nice if it all worked out" kind of mind set, while at the same time tracking an exit window.
I believe that the military folks have a saying: Embrace The Suck. Sounds like fun, huh?