My Mum was a hands on healer, she worked with animals and people effectively. She maintained that it was a very simple process of letting go of self and mentally attuning upwards to a universal 'Spiritual Light' source and then drawing upon that and becoming a vehicle for higher will (or whatnot!), while she simply focused on the person being worked on. She never worked on more than one person at a time though.

If it's easier to attune to a deity or spiritual figure like Christ or Buddha, or maybe for non-spiritual types simply the natural life-generating energy of the Earth or the Sun, I think it works just the same. My Mother was a lapsed Catholic, and while attuning to generic spiritual Light had a spontaneous experience with a feminine force of divine compassion that she equated with Mary, Mother of God during one healing. It left her quite emotional for the rest of the day.

I think it'll be interesting to join in, just for the experiment in mental alignment with a bunch of others if nothing else!

In both church based healing prayer and in general long distance healing practice, it is usual to write down all the names of those to be focused on on a piece of paper, and then read them out right at the start of the healing/prayer session.