surround a visual block with character(s)

What's the most efficient way to visually select a block of text and
append/prepend a character or more?

In other words, I often want convert this:

blah blah foo foo

to

"blah blah foo foo"

I assume there are plugins that help with this kind of thing, for
which suggestions are welcome, but I'm curious how to do this most
efficiently without them.

c
--
Chris Lott <chris@chrislott.org>

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