When you work as an employee, you will tend to think or do your work to prevent errors as much as possible. This will condition your mind or thought process to fix to one way of doing things.
As an entrepreneur, it is the extreme opposite.
By all means, make mistakes, learn from the mistakes and grow.
It is ruthless out there, the more you make mistakes, the more it prepares you to be sharp in business acumen.
As an employee, unfortunately the environment does not allow you to practise making mistakes...you will get fired, right?

Here is a great example to explain the subtle difference:
Employees will ' ready, aim, fire".
Entrepreneurs will ' ready, fire, aim'.

 
 

Discipline:
The first trait is whether you have the discipline.
You see, when you are an employee, you have the "discipline" to go to work on time and to work daily as required by the company.
As an entrepreneur, no one will tell you to start work on time and no one will tell you to work Mondays to Fridays.
Most new entrepreneurs will find this new freedom a joy.
The joy soon turns to become a habit and if you are not careful, you will lose precious time to get things done.
At the same time, if you are currently an employee and is always late for work, what makes you think you can succeed at your own business?