###Easy Method###

Use surround.vim plugin

###Native Vim methods###

	__Quote a word using single quotes__

	`ciw'Ctrl+r"'`
	
		* `ciw` 	- Delete the word the cursor is on, and end up in insert mode
		* `'` 		- Add the first quote
		* `Ctrl+r"` 	- Insert the contents of the `"` register, aka the last yank/delete.
		* `'` 		- Add the closing quote


	_Unquote a word that's enclosed in single quotes_
	
	`di'hPl2x`
	
		* `di'` 	- Delete the word enclosed by single quotes.
		* `hP` 		- Move the cursor left one place (on top of the opening quote) and put the just deleted text before the quote.
		* `l` 		- Move the cursor right one place (on top of the opening quote).
		* `2x` 		- Delete the two quotes.

	_Change single quotes to double quotes_

	`va':s/\%V'\%V/"/g`

		* `va'` 	- Visually select the quoted word and the quotes.
		* ``:s/`` 	- Start a replacement.
		* ``\%V'\%V` 	- Only match single quotes that are within the visually selected region.
		* ``/"/g` 	- Replace them all with double quotes.

See [Stack Overflow Ref:](https://stackoverflow.com/questions/2147875/what-vim-commands-can-be-used-to-quote-unquote-words)