I've never done the ROSS Sizing Audits; just the customer service shops, so I can't help you there.
But in my experience, most schedulers are pretty understanding, especially if you're new
. Just don't make a habit of letting them down. I was really bad my first couple of weeks of MSing, but finally realized that I should get the job done, even if it loses me money, because a commitment is a commitment, and I might need a good relationship with that scheduler in the future.
Somewhere in the Midwest, shopping / auditing full time since 2014. Will use PV-500 for food!