Why a coach is needed
You can only run a marathon if you train a lot. If you train all by yourself, you need a lot of perseverance and the risk of injuries is high. It goes much faster with a coach and you achieve better results.
The same applies to learning research skills. You can learn a lot from books and you can spend hours on the internet, but a good coach can tell you where the information is that you need and can answer your specific questions. Consequently, you learn the needed research techniques faster and easier, and it increases the quality of your research.
Everyone needs a coach every now and then. A coach is someone who encourages you to keep going and who points you to a better and easier way.