How to solve the last two centers of a 7x7 (walkthrough)

Unfortunately, I'm too stupid to understand what you're doing. I know it's a lot more efficient than what I do, which is to just trade columns if it makes the yellow block more yellow and the green one more green. And when I run out of that stuff, I commute.

When you get an SS 7x7 you're really going to like it as it is so much easier to turn.
 
I solve the last two centres of big cubes by getting as close as possible and using commutators to finish the job.

Also there is a really good Youtube video from Lancetheblueknight on using commutators to solve the last two centres.
 
I can't find the link, but I suspect that I learned the commutator method from a Lancetheblueknight youtube. And I believe that by studying this video carefully, and setting up a cube to follow along on, I'll learn it. I'm basically just lazy.

I'm in the midst of painting my 7x7 (and 8 other cubes) so it will be a few days before I catch up with this.
 
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