I wouldn't call this "advice" as such but it was an exchange I had with my sword master through one of the Korean students as I was watching him practice his cutting. Noting my observing he mentioned that learning to perform a decent cut required "10,000" cuts of newspaper before moving on to the next material. Trying to be clever I responded back through the student that maybe he could certainly get by with 5,000 cuts as it was still a respectable number. "No", he said said, "I would know the difference". I pressed the point thinking that he had misunderstood my point and repeated that 5,000 cuts was still a respectable number and it was not like anyone was keeping count over his shoulder. "No", he said " I would know the difference." FWIW.
Best Wishes,
Bruce