In fact, there are several steps to become a polisher
1 - First of all you must have an inborn aptitude to polishing (I know this, because I have not this aptitude)
2 - you must have a qualified teacher
3 - you will have to learn all the steps thoroughly (which takes years) and will have to master totally a step before passing to the following one.
4 - you will have to understand steel so as to use the right stones at the right time.
5 - for this you will have to learn kantei...
Too tired to carry on, it is almost 2 a.m.