Keep you grades as high as possible (better than a 3.6).
Do well in your core nursing classes and science classes.
Take organic chem or bio chem.
Get your one year of ICU experience (some require two) in the highest acuity facility in your area.
As soon as you are eligible take your CCRN exam (one year of ICU experience is required).
Take the GRE if the schools in your area require it.
Shadow CRNAs that are Alumni from the schools in your area.
Get good recommendations from former professors, physicians, or current CRNAs.
Wright a great personal statement.
Volunteer on an ambulance if possible in your area.
Keep your debt down and start saving now.
I did it, and so can you.
I start at Columbia University this Summer.