Keep a food journal. You're serious about this, right? So grab a notebook or download an app (there are dozens of free ones out there). When you come face-to-face with what you're eating, it's a lot easier to see where your downfalls are. And to see your progress! And lots of apps have neat things you can mess around with that are pretty motivating, Index of / this diary, you'll be counting calories and tracking them. That way if you do really well on one day, you can fudge a little on the next. Or vice versa.
Nix nighttime eating. This one is less about science and more about psychology: humans have a tendency to eat the worst stuff (and/or the most) at night. So if you swear to yourself that you won't eat past 8 PM, those late night taco runs won't be happening. And when those late nights roll around and tu quieres tacos but you opt for that glass of water instead, that's poundage falling off. It's tough socially, but it's worth it.
Every so often we find that there is something that is not pushing us enough for us to achieve that which we would like to. The cause for this is not in your efforts may be, it could lie with your mind. There is a great chance that you are not entirely motivated to lose weight in 10 days. If you think that you are lost and have no hope to get going then here is some motivational ideas that may help you. For starters, stand in front of your mirror and ask yourself if you like the person you are staring at before you start asking how to lose weight in 10 days. https://www.youtube.com/watch?v=cIWBSfa-FLA