Ok, so I'm a complete retard and didn't read the entire post. I shoulda learned that one in 3rd grade.
I went in 1994. If it's anything like when I went:
Hope you studied up your land navigation. We spent nearly a week of the two weeks on map reading and land nav. Since you're Infantry, that shouldn't be a problem.
If you're in any kind of physical shape, the PT will be a joke. They're testing your ability to LEAD physical training, not your ability to do pushups. You'll have to pass an APFT, but the day-to-day pt is nothing difficult.
If you prove proficient at map reading, be ready to spend after-hours assisting other (combat service support) soldiers who can't read a map to save their lives. Do it. The instructors will expect team-work from you, particularly as an Infantryman, particularly if you expect to be a leader.
If you have a fear of public speaking, get over it. You'll teach several classes while you're there. If you get to pick the subject, pick something you REALLY know (I got lucky and got the claymore class). They're not grading you on how well you can set up a claymore, they're grading you on how well you can teach tasks to soldiers.
Don't talk about how much you know, SHOW them how much you know. BE the leader.
Make sure you take an Army Values card. I've seen some of the Reserve and National Guard send soldiers home for showing up without one.
Best of luck!