One of the considerations which most either forget (or never knew) relates to what is on the service end of the C/B. Just because it is labelled "XYZ" doesn't give you any guarantee that it doesn't also provide power to "ABC" and "RST". The electrical engineering folk who do the ELA work will make a point of finding out and knowing and the OEM procedures can be presumed, likewise, to be based on knowledge, rather than well-intentioned guesswork.
You pull C/Bs at your potential peril unless you either have done all the homework or are following OEM or specialist electrical guidance.