Steve C. Gave you lots of good advice. You say you are a newby to hiking which is no big deal on the main trail but if you are new to fitness that is a problem. Also you did not state where you live. If you live at or near sea level you will definitely need to do some hiking at altitude before September. Good news you have plenty of time to prepare. You also did not mention your age. I was 60 when I first Attempted Whitney as a day hike and thought I was in good shape but Mt. Whitney laughed at my fitness level. Read as much as you can about the hike between now and September and good luck. Gary.
