I also think it is doable. That equals 7 lbs a month in weight loss. Very healthy goal! My suggestions are 1) give yourself a little wiggle room on your diet. If you need a sweet treat give it to yourself but in a small portion. 2) try journaling. Helps deal with frustrations and planning. 3) reward yourself with non-food items. New shoes, movie or workout clothes every 10 lbs or so. Will help keep you motivated. 4) keep us posted on your progress. We care!
Good luck and congrats!