How to lose, like lots of stomach fat by Valentines Day?

So, at Garage today, I bought this ADORABLE top... it's a thick sweater type long sleeved shirt, it's light blue colored with light pink and purple flowers... so, the thing is, it's such a nice shirt, totally my style... but ummmm... it doesn't exactly fit. Okay, it does fit. But, I mean, I am a little large in the middle compared to everywhere else, and that's why I like to wear stuff like a solid colored tank top with a cardigan, because it doesn't bring much attention. But this shirt is kind of... gawdy I guess, and it does draw lots of attention, and I only bought it cause it was soooo adorable, and it was on sale for about 10 dollars and about to go out of stock. Anyways. I've also been trying to lose weight, and now I have a good reason. Of course, I won't lose enough weight to look good in the shirt right away, but it would be the perfect shirt for Valentines day. So, my workout plan was to do cardio 5 hours a week, (so like, one hour a day, minus two days) and on the two days where I don't do cardio I'd do a pilates video targeting the abs. And once I see some slight results, I'll start some situps and side bends, cause I know you're supposed to wait to burn the top layer of fat. And also, I'll eat healthier, not eat as much snacks... Does this sound all well? I'd really like to shape up by Valentines day... xx