You can do it!
Just cut out the beer and the fries and if you can, exercise in the morning. Running just one mile in the morning (or walk/run) will REALLY amp up your metabolism.
IMO, that is the key is sparking the metabolism early.
If you can then hit the gym after work, you are good to go.

It's more a matter of consistently doing some simple exercise more than doing anything too fancy or dramatic, imo.
If all I do is simply stop eating fries (I eat Wendy's everyday, literally), I lose about 6 pounds in two weeks every time. It's really not rocket science, but it ain't easy either.
My entire family is overweight (on both sides), so I do know what I am talking about.
I gain weight really fast if I don't "watch it".
I gained 16 pounds in 2 months at the stupid desk job.

Oh, if you can score some crack off of the central avenue area and not sleep for two weeks straight, you will lose weight real fast too! Wouldn't recommend that m.o. though.