I found something I had written for a friend a few months ago (last October, actually) when he asked for fitness advice. I find my own advice, written at a time when I had a regular workout routine, motivating me to start my regular routine once again. There are many reasons (excuses) why I've let my routine slide, but I won't give myself the opportunity to mention them!
Whatever you do, stick with it. If you feel like program A is not working, then don't quit! Modify the program and keep going. Consistency will pay off, whether you're doing the right thing or not.
Eat more healthy. This is kind of obvious, but start with eliminating SODA and any other junk food. Watch the nutritional content labels for high saturated fat and sugar content. Eat more fruit's, nuts, and veggies.
DRINK A LOT OF WATER! If you're lucky enough to work close to a bathroom, drink water until you're pissing every 10 minutes; seriously. When your body changes and fat decreases, your body needs to get rid of all the toxins in your body. It does that by using WATER as a transport mechanism. If you don't have enough water, your body will simply become more toxic.
Don't kill yourself. Create a schedule that fits your lifestyle. For example, start small by dedicating 30 minutes every day to workouts. Then start doing it twice day (30 min morning, 30 min night) if possible, otherwise just increase your workout time. If you feel REALLY sore the day after working out, give yourself a day's rest and start again the following day. Your body does need time to adjust, so give it time. But at the same time, you should be trying to push your limits. Don't use the soreness as an excuse!