This is a funny one, but one that you should bear in mind. We tend to like our own ideas – if they’re our ideas, then they must be right, right? But don’t kid yourself – make sure you have plenty of objective advisors who will challenge your ideas. As mentioned above, this one is highly related to the “don’t business plan in a vacuum” rule. The key takeaway for this rule is, since it will be very difficult to “keep yourself honest” as you plan and work to build your business, make sure you surround yourself with partners, employees and other players who will not be shy about challenging you and your ideas. You don’t want to allow yourself to be lulled into thinking that you have all the answers, and this can easily happen, especially if you begin to encounter some level of success. This one can kill your company, if you get lulled into believing all of your own ideas. Don’t drink your own bath water.