Business mistakes - what are/were yours

[Max Turbo]

Everyone knows there is a wealth of information in this forum from business owners, but everyone makes mistakes, especially when starting out.

What mistakes did you make that, looking back, you would have done differently?
What assumptions did you make that turned out to be false?
Has anything happened that you didn't expect which has turned out for the better?

Whilst it will be interesting to hear the anecdotes, mostly I think that this will help any budding businesses that are in the process of setting up or who are at the early stages.

Thanks!