My boys don't miss many meals, shed like they were born to do it, and any snake can be stressed if not cared for properly.
With BPs, proper husbandry will take care of 99% of sheding and stress issues.
As for them going on fasts, some do, and some don't. I've found it to be much less of an issue if you don't breed, and even less common if you only keep males or females, not both.