What do you avoid when starting up or managing a business?

[Shortie]

When it comes to starting up or even managing a business, there are some things you will always ensure you do but in some cases, depending on what you are wanting from your business, there may be things that you avoid when starting up a business that you know would not be good for your business. 

When starting up a new business, what are some things you stay away from? Is there anything that you avoid at all costs that you know would hinder your business rather than help make it a success?