Hi feetface!
RawrGirl understands the whole weekend thing. She is doing a low-calorie version of Atkins. Basically, she eats low carb but still keeps her calories down (800 Mon-Thurs, 1500 on Fri and Sat, 1200 on Sun). One weekend a month she goes out of Ketosis and eats carbs (and doesn't count calories at all). And, very important, she lifts weights (10 pound dumbbells) 6x a week (upperbody one day, lower body the next). This has worked very well for her as she has lost around 30 pounds since September (up a bit from Christmas though).
So if weekends are harder for you too, you could work them into your diet, cutting a little more during the week so that you have the extra on the weekends.
Also, RawrGirl drinks every weekend (vodka and diet soda), as the hard stuff won't knock her out of Ketosis (most wines have sugars). What RawrGirl loves about Atkins/low carb is that she always finding something to eat when she goes out. On Sunday, she attended an event and ate sausage with onion/peppers (everyone else ate them on a roll), pepperoni and cheese (skipped the crackers), and veggies and sour cream dip. If she were just counting calories, she'd barely been able to eat anything, and probably would have gave in. Knowing she was still in Ketosis made all the difference mentally, as she knew today's exercise was burning pure fat rather than needing 3 days just to use up all the carbs stored in her muscles.
And great idea to only weigh yourself once a month! RawrGirl was a daily weigher until Prince Charming (hubby) got tired of her crying and hid the scales this past Spring. Now he only gives it to her once a month (the Friday morning before her carb/treat weekend). She gets to weigh in, update her stats with her loss, post pics in a new outfit (or the same jeans showing them looser and looser), and then enjoys her weekend. Monday morning, she jumps right back into diet because she's still so excited about her loss (and motivated for next month's), she got to have her treats so she doesn't feel deprived, and knows that after the first 3 days she is back in Ketosis again for the rest of the month.
Hope some/any of that helps!