I completed the JMT in 19 days late Aug - mid Sept / awesome. I used these maps http://johnmuirtrailmap.com/ along with the Tom Harrison map pack. They also have a "poster" size map that I framed and looked at every day leading up to my hike - and after! I also read the book by Elizabeth Wenk http://www.amazon.com/Elizabeth-Wenk/e/B004R0TMBC. Fax in your permit exactly at the first opportunity! Like at 5:01 on the first day you can. Good Luck!