DONT'S
1. No cheating, it can set you back days and days (by knocking you out of ketosis) - not even 1 M&M during induction
2. Don't weigh everyday (I don't follow this rule but it's a pretty popular one)
3. Don't panic when week 3's losses aren't as big as weeks 1 & 2. You should plan to lose 10% of your target loss in weeks 1 & 2 and then 5% per month afterward.
4. Don't forget about exercise. Lots of great stuff on the forums here.
5. No nuts till after induction.

DO's
1. Get enough calories, and fat. Fat should be 70% of your calories.
2. Eat your allowed veggies and supplement with psyllium husks to avoid the dreaded "undelivered mail"
3. Count hidden carbs such as those in sweetener packs and items with <1g of carb.
4. Measure yourself with a tape measure so that when you're not seeing scale progress you can still see shrinkage
5. Pursue new recipes and try something new several times per week to avoid boredom