PCR of 9

Session 1 was a PCR of 9. Planned a carom to make the 8, 4 balls ahead. Got down to 2 balls and didn't have the position I wanted. While I was stroking the shot, I remembered I had to mow lawn today! Stray thought. Ran the next 2, and ended up with a bank instead of the carom. It was 1/8 of a dot adjustment to the SSL for 1st Gear.  Missed it! Well I gotta mow the lawn today so I can't do what I read Jeanette Lee would have done---how many practice shots?  many hundreds I KNOW!   Lester