Sometimes my FirstName fields look like "john" instead of "John". Is
there an easy way to format the merge field so it capitalizes the first
letter of certain fields no matter what?
Use Alt-F9 to reveal the field codes.
Then change, e.g.
{ MERGEFIELD FirstName }
to
{ MERGEFIELD FirstName \*Caps }
There are other such "switches" - they are documented in Word Help.

Signature
Peter Jamieson - Word MVP
Word MVP web site http://word.mvps.org/
> Sometimes my FirstName fields look like "john" instead of "John". Is
> there an easy way to format the merge field so it capitalizes the first
> letter of certain fields no matter what?