Operation kick my butt back into shape

Here I go again...trying to get into a work out and diet plan that I will stick to.  I have about 20 or so pounds that I want to loose by burning fat and really toning up and getting healthy again. I know that I have the ability to do it, it's just keeping with something that seems to be the problem for me.  My fiance and I did P90X for a few months back in December.  It went great....for the first month or so, until it became too time consuming ...