Are you doing this in an Access Database or Word documents? This
might be best posted in a different forum, as this is for Access
Databases.
If you hold Alt and press 0176 on the number pad, you will get a °.
The fastest way might be to setup your own AutoCorrect options, then
you could set it up so a certain string combination will AutoCorrect
to the degree symbol.
For example, setup ^o to autocorrect to °.