I've written a lot of books now; I've been published for over 30 years. I hope with every book I learn something new, and with every new novel I try to improve the process of writing.
Boot Camp was great and very interesting. You got to use live rounds of ammunition and got to do a lot of crawling around with live rounds flying around you, so you really had to learn to keep your ass down - everything down for that matter.
If you take an hour out of your day to meditate, you will progress ten-fold. By staying mentally focused, you can let your worries go.