Census indexes are fairly easy to search (usually) as the search are generally easy to understand. However, if you are search records in other databases, do you understand what all the search terms mean?
As a quick example, if you are searching the Bureau of Land Management website (http://www.glorecords.blm.gov), do you know what patentee means? Do you know what warantee means?
If you are searching the marriage bonds at the New Brunswick Provincial Archives website, do you know what a marriage bond actually is?
Makes the searching more difficult if there are terms used in the database that you do not understand.