The answer to this question can vary considerably. If you’re concerned about cost, your best bet is to do everything you can to avoid unnecessary costs such as having to refile your application.
A patent attorney will not only perform a thorough search and file the application on your behalf, but he or she will make sure that it is done so correctly. While the initial cost is an investment, it is not as expensive as having to pay for unnecessary mistakes.
For some additional insight into this topic, read Patent Applications: 7 Things You Need To Know
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