Importing checklist (modern MLB setup):
1. Backup ootp12 league
2. Install v13
3. import v12 league
4. Check all league settings, especially finance settings
5. Add custom views back into game (tables folder from v12)
6. Check trade settings (back to default for now)
7. Make sure league evolution is off (unless you haven't moved Houston yet, I did that last season)
8. Check to make sure playoff settings are correct (2 wildcards) and new CBA is enabled.
9. Update any mods that need it. (LGO schedules, put those back in)
10. Spends hours looking at everything to make sure import was a success.
Drink a beer.. (optional)
Just thinking out loud...