Focus on what the reports are telling you. Shift report focus by adjusting filters exposed by the designer to change department, year or any dimension. Using predesigned links, drill to related reports and follow the money.

1-reader
Open and run reports that have been built by power users
2-reader-drill
Run to retrieve live data at any time and drill to the detail, speeding up month end.
3-reader-journals
Examine the underlying detail, and maybe drill to related invoices ...
4-reader-invoices
Perhaps amend to look at all Invoices for the customer in question ...
5-reader-export-to-excel
... and Export to Excel.