10 pounds in 1 week sounds too drastic.
Just plan small goals to lose weight gradually, say 3-5 pounds a month. Start small till you know what your own ability and determination. Thereafter increase it in steps. This is long term and you'll stand to gain more.
The last thing you want is to lose 10 pounds in 1 week, and then fail. You'll lose motivation.
Plan to eat healthy, and exercise regularly.