I am starting today too. I did really well a couple of years back, but have spent the last year trying to get back on track and it (or me) not working. I am determined that this time I will keep it up, I just need to get through the first few days.
If you manage to get to the 3 week marks that is really good, I always find once I am past the first week it is fairly straight forward, I just struggle getting to that point.
Good luck.