I've made it a personal goal to stay positive during stalls and rebound. The lifestyle change has to include some mental adjustments too.
You eat and exercise like a man of normal weight, you stick with it day in and day out, and you are still overweight. It's frustrating and seeing the scale move in the right direction is one of the few quantitative measures you get, and as such it's quite important.
I try to think about how few days I've been living a healthy lifestyle compared to how many hedonistic days I've spent in my life.
I try to think of reaching my goal weight as an adjustment period. Even if it takes years it's still an adjustment period and after that adjustment period I'll be living the healthy lifestyle and have the health and body to match.
I'll keep a regular watch on my weight to keep it where I need to be, but there won't be anymore living like one person and being another. It's akin to multiple personalities. There is the slim guy that exists in the actions you take and then there is the fat guy who physically exists because of past abuses (self-inflicted). Weightloss is the therapy and the fat guy slowly disappears and the slim man that you are behaving like will gradually appear.
For me it's a bit scary because I've never been that guy in my life. But overcoming that fear is another mental adjustment I'm making.