Start of Lent

I'm going to try and follow Rick Warren's book, "The purpose driven life" as part of my Lent reflections and treat it as a 40 day study. Missed the first day of Lent as an entry due to long work day, including 450 miles of driving, but hoping to get back on course. 40 days keeps coming up as significant with various people in the Old and New Testaments, so let me see if this can be a life changing experience?