Let me show you something:
then dF(x) =n*x^(n-1)
Do you now know differential calculus? No. Though I could teach you that rule, the d(e^x)=e^x rule, the product rule, and any number of other rules, drilling them until you knew each perfectly, you would still not know calculus.
Why? Because you do not know the theory, the rationale. You do not know that these formulas are all simplified forms of the slope formula with zero distance between the points, and without higher level algebra, you couldn't understand how that is acomplished. Therefore, I could do something slightly different and throw you through a loop. The same holds true for swordsmanship:
You cannot learn a "move" until you learn how to swing a blade correctly
You cannot swing until you know how to grip
You cannot grip properly unless you know how to run
you cannot run until you learn to walk
You cannot walk until you learn to stand
You cannot stand without first falling down.
All along the way, you will learn bad habits almost instantly and take months to unlearn them. Unless your friend is a prodigy in teaching and you are willing to spend a long time learning and overcoming both his and your mistakes, this will not work. People must spend a long time learning before they are ready to teach, and even then they mess up.
My suggestion is that you ask your friend to give you a lift to his kenjitsu school until you get your license.