From experience, I can tell you that the exercise issue will get easier.
I work in a pharmacy, and I'm literally on my feet for 8-9 hours with only a 30 min. break. I've always used that as an excuse to get out of exercising.
But I realize that exercise is the key to becoming healthier, so I forced myself to do some walking. That's really all it takes. Start out light, but you may just have to force yourself to do it. I started by designating half my lunch break for eating, the other half for walking the length of the strip mall and back. The first week was the toughest part as I didn't feel like walking, but I made myself do it, and now I actually enjoy it. And when they say that exercising regularly gives you more energy, it really is true. I walked 2 miles over the weekend, and it wasn't a chore! :)
Plus a great motivator is just the knowledge that I'm doing something to improve my health.