I also recommend making small 5 pound mini goals for yourself. No, you may not be excited to weigh 230, or 225, or 220...but do something to MAKE yourself excited about it!
Make a plan-when you lose 5 pounds...plan to buy yourself that new lipstick or book or whatever, that you have been wanting, but have never bought. When you hit 10 pounds lost, go to the nail place and get a manicure. (You can get a regular manicure for $10-$15...your own nails, you don't have to get acrylics or anything fake.)
Make a small reward for yourself-something that you want or like to do, but "never do" for yourself. Make every 5 pounds a reward to yourself, for doing so well.
There are women who "collect" things as well...who buy those Italian charm bracelets, and buy a charm for every 5 pounds...or buy a Beanie Baby to represent every 5 pounds...there are lots of things you could do.
The next thing you know, you will have a real reason to get excited-because after 4 or 5 of your 5 pound rewards...you might have to go buy a new pants size, or new bra size, or something like that!
Honestly, if you weigh 235 right now...I think you are going to start getting excited WAY before 160...once you really see the changes in your body through proper diet and exercise, or someone notices your loss when you hit 200, or 190, and SAYS something to you about it.