To assure consistency of variables as you are creating documents, you may wish to create a (more or less) permanent DropDown List of those variables. This will allow you to point and click to insert a perfectly formed (and spelled) variable at the precise location needed.
Pathagoras can also easily replace a personal value in a document with a variable. Think instantly replacing 'John Doe' with '[Client Name]' in 10 different places in your document with a single click. Just highlight the personal value, click on variable from DropDown List. Instant replacement, with the identical stylings --font, size, emphasis, color).
Creating the list is discussed at this link.