Success in SFI has always been about pacing, taking each day one at a time. You can have your PSAs focus on doing their daily actions, one Launchpad lesson, plus however many Getting Started actions they feels comfortable doing. Communicate with them once a day, encouraging them, offering a little more, as they're ready, and based upon the activity you see on their VP Ledgers. Working incrementally gives people a feeling of constant accomplishment without the risk of overwhelming them.
