Remember that this is a long term set of behaviors, not a short term commitment. Does it matter if you lose three pounds a few times over if, long term, you've lost all your excess weight? What difference does a month or three in the weight loss phase make over the course of the rest of your life? I can strongly attest to the fact that even though it sucks to be in the middle of it, the difference is completely forgettable even six weeks further down the road, let alone six year or six decades!
Just be persistent and remember that the tortoise was the one who won the race