"more often than not, the summer weather, the heat, the humidity and the natural anxiety can get to you"..
Once the big day is over, your wedding will be remembered through your photographs (and, perhaps, by the food served! lol). But, try and plan and prepare as you may, more often than not, the summer weather, the heat, the humidity and the mounting anxiety can get to you. Yes, you will look your "best" - but this just may be almost-but-not-quite perfect! Yet "perfect" is exactly what you want, isn't it? Especially, for that life-size portrait your parents will display on the fireplace mantle :-)
Fret not! Professional models and the fashion industry have been "cheating" for years. You didn't think they can look that good, every time, did you? It used to be called "air-brushing"; now it is simply called "photoshop-ing". Anyone can do it (if you have the software) and an image professional can do it best. (another good reason to seriously consider not DIY-ing your wedding photos)