No doubt hiring a business consultant can benefit your business. However, to make the most of it as a service, you have to
a) Hire the best you can afford – with great recommendations and great experience
b) Learn from them- how they work, what techniques they use, and what third-party services, websites, or software they use.
Attitudes are great, but make sure you learn as much from them as you can. While the main reason a business owner should hire a business consultant is that they need help, there is no point in paying money and learning how to emulate their techniques and understand the third-party services they can use. If you want to consult professional business consultants, then you can consider this reference: EGN Singapore – Making Each Other Better.
Many entrepreneurs use a trial and error gung-ho approach to scale up their business. Look what happens and if it works, great.
With business consulting services, you can get started quickly, solve any problems you face immediately, and make more money as quickly as possible. What you lose in "learn for yourself" is better spent on your business knowledge for outsourcing and offering a better return on training costs.
So, if you think you need more knowledge than you already have, don't wait until you learn by trial and error, pay for it and continue building a successful and profitable business.