My best decisions were made with coaches. My worst decisions were made when I did not have coaching. My personal experience and a pattern I have seen repeated in countless others for years. 100% worth getting a coach/mentor. Every good team has coaches. The best players have coaches. Business is no different.
The question, and the tough part really is, how do you know if a coach/mentor is the best fit for you? That starts with you knowing what you are after deeply. I will tell you far too many people treat this as an intellectual question and get burned as a result through zero bad intentions on anyone's part. You have to go deep and really know what you want and why. Most people I come across think they know only to find out when we spend time together, that they rarely do beyond intellectual obvious reasons (financial freedom, more money, do what I want whenever and other common easy answers).
Look for a coach to go deep with you. In my experience, the cost of those coaches is pennies compared to the value given and time/effort and pain saved and/or avoided.