The procedure to install is very easy, you can also always uninstall it and reinstall the official one, I don't think it's irreversible in any way. Note that I am talking about side loading using developer mode. Rooting the TV via an exploit can brick your TV instead.
Edit: The procedure is basically described in https://webostv.developer.lge.com/develop/getting-started/developer-mode-app.
I realize I said very simple, but I guess it depends on your familiarity with tech and command line tools.