Planning
If you are an expert in investing, have the time needed to do regular research, and have the discipline to stick to an investing methodology objectively, then you can do your own investing.
This is a common question asked by many young people who have just started their journey to save for their future. If you have this question, then I am glad that you intend to invest for the long term. I am also glad that you are open to seeking the help of an expert to help you make your investments.