Please keep us posted on how you make out.
And stick by your guns in terms of an early start. You know your own capabilities better than anyone, so don't let anyone shake your confidence. And, while I've heard plenty of people say "I should've gotten an earlier start", it's pretty rare for anyone to say "I started too early"... Of course, some of the faithful contrarians will jump in here.
Trust your instincts, and try not to let your large animal phobias get in the way. There is wildlife on the mountain, but it's a treat when they show themselves. The marmots live at/above treeline, and I've never seen them active at night. Plus, they're vegetarians, and their bold antics are fun to watch.
Enjoy your adventure.
