If you want to be successful at weight loss you must have these 2 in your arsenal.
Persistence: and Perseverance
they effectively get to the same point, which is that even if you are not successful - keep going, if you're having a bad day - keep going. If you plateau - keep going. You didn't get fat overnight....it took time. It will be the same to lose it.
Eventually there will be a big payoff for you - lots of weight loss. Making a big life change can sometimes be very scary, but you know what is even worse - Regret.