I'd suggest:

1. taking a photo of yourself now to compare with how you look at the end.
2. taking measurements once a week of your waist, arms, neck, and hips. Same time each week.
3. keep a food journal and write down how you feel and what you ate after each meal (for bonus points!).

Enjoy!

Depending on how badly you were eating prior to starting your 30 day, you may have a "crash" [low carb flu] or general malaise for a few days. I didn't get this, but a lot of people do.

Expect recovery post workout to take longer if you aren’t carbing PWO.

Expect to spend more time preparing food, and less time eating out (assuming you’re coming from SAD)

Expect to sleep more. This one was HUGE for me... I slept horrible and way too little. Going paleo, this was the hardest part for me. I still don't get even 8 hours, but I at least get nearly 7 hours most nights.

Don’t expect a magical Zen-like calm or substantial perceivable change in how you feel or view the world. Paleo is great, but it isn’t a whole new world for most people. I feel great on paleo, but I felt great on SAD too.

Take before and after pictures. I didn’t do this, and now I wish I had. Its great to be able to look back and say, “Dang, that was me?” or “Damn I look good naked now.”

1. Avoid restaurant food.
2. Get enough dietary fat (from butter, coconut oil, etc.).
3. Don't overdo the training/exercise. Give yourself "down" time for recovery (if applicable).

Gets lots of sleep. Drink lots of water - need to stay hydrated and helps to flush stuff out of the system. Do not expect great changes (this just sets one up for disappointment) but be open to changes as they will occur.

Do your challenge with someone else to keep each other motivated. Also, LOG SHEETS! These are crucial. The A TO Z Weight Loss Study out of Stanford showed that one of the most important factors to a dietary change was tracking what you at. Don't underestimate the power of accountability.