The most commonly taught method of mettā meditation is done by silently repeating phrases. It is best to have about four simple phrases. Complicated phrases and more than four of them don’t as easily generate the concentration necessary. I suggest using something like the following: May (I/you/all beings) be happy. May (I/you/all beings) be healthy. May (I/you/all beings) be safe. May (I/you/all beings) be at peace.