I use vim-surround. https://github.com/tpope/vim-surround

Great plugin. Everything Tim Pope produces is gold. All Vim users should check out his whole collection on GitHub.

A fairly easy way to do it is either

c()^[P or c(^r")

The first leaves you in normal mode the second in insert mode. I recommend vim-surround by tpope though.

I used vim-surround for a long time, but I prefer vim-sandwich now: https://github.com/machakann/vim-sandwich