On an average, overweight people tend to lose about 20 pounds in ten weeks - and keep it off. It's far better to do even a small part of it than to do nothing at all. Anything you can do will improve your situation. Often there are ways of modifying what you can do to gain similar or partial benefits. Do as much as you can.
Travel makes it more complicated, but many people on the program travel regularly.
With careful attention, one can usually keep very close to the program. Learning what to order when eating out can keep the diet within reason Taking walks and using stairs instead of elevators are examples of getting exercise. The Internet has many sources for mail ordering foods. Often local yoga or meditation classes have information on support groups. The simplest way is to find the number of calories per serving is to divide the number of calories from fat by the total calories.