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I hope he gets along well with her, especially now her knives are shaving sharp :)

I think regardless of your skill or light touch or worn out belts, if you are working on a slack belt you will introduce a convexity to the edge that will take time & effort to remove on the next...

Maybe yes & maybe no. As a beginner has no real point of reference for comparison it is hard to say.

Maybe if you have large hands a 6/8 is more comfortable to manipulate but maybe not....