Training is now so accessible that the main thing would be desire, and, of course, you can listen to the advice and recommendations of professionals.
I think for learning forex trading one must develop a reading habit and start by reading some good books such as An intelligent Investor is what I started with.
You can, in principle, go through the entire course of study yourself, but it will take quite a long time, so think about how it will be best for you.
A mentor is of course needed but the main problem is so many Mentor right now are found in online and most of them are found as scams.
First of all, you need to go through the training and of course you will not be able to practice differently