I'm working on losing 100 pounds. I've only been at it for just over a week...this time...which will be my last time, but the thought of holding myself accountable to lose 10 pounds per month seems reasonable and does not overwhelm me.
Of course I hope to lose more than 10 pounds per month, but 10 pounds is a reasonable number to me. Think of a number you feel comfortable with, and go for it!
Best of luck to you!