The biggest Good Friday trap is equating it with Easter Monday. Easter Monday is a statutory public holiday with general public-holiday rest. Good Friday, by contrast, is a normal Friday for most people, even though the religious rank of the day is very high.
In practice, the special effect comes from its position in the calendar. Anyone who gets Good Friday off automatically connects it with Saturday, Easter Sunday and Easter Monday. A single free Friday then becomes a four-day Easter block. For families, Good Friday in Austria also regularly falls in the Easter school holidays.
A reliable order avoids misunderstandings: first check whether Good Friday is free from work, then classify school, opening hours, travel traffic and Easter dates. The religious meaning remains important, without treating every everyday question like a public-holiday rule.