Looking into it, most instructions I've found say to utter certain words and to focus on an object in your mind.
I'm not about to chant words that I do not know or to focus on anything but Christ.
My interest is to strengthen my communication with Jesus, nothing more, nothing less.
However, some instructions say to choose your own mantra and to imagine something you choose.
Mantra Jesus and focus Jesus, couldn't hurt.
I've got a lot of house cleaning today, but perhaps I'll find a time of peace to try it tomorrow. I'll be very careful.