Preparing to serve Sapo, the Matses frog medicine

Someone wrote to me today saying that when they serve sapo/kambo, the frog medicine, they sometimes do not feel connected to the medicine. They said they wanted to feel more connected when they served and could I help. This is what I wrote:
Dear X: When I am serving any medicine, I always start by cleansing myself. In my case I use cuma lunga and agua florida. It's a 20 second cleanse, but it gets me out of being me and gets me into the medicine space. You could use mapacho, a quick meditation, a rattle, anything to get you out of being you and into being a medicine server. 
     Then, though it is NOT traditional, I sing the people for the first four minutes or so of the event. I sing to the frog to come and cleanse the skin, the blood, the heart, the lungs, the stomach, the liver, the kidneys, and then the head, the spirit, the soul of the person/people being served. I ask that it eliminate toxic things that those people do not need. I sing for it to work deeply but with tranquility so as not to cause fear and add to their toxic load. When I am done I am quiet. Somehow that attunes me, and it eases their entry into the medicine. When I forget to cleanse myself beforehand I can feel it immediately: I might be scraping the stick with saliva and realize it feels like I'm spitting on a stick, rather than sharing the best clean part of my spirit with them. So I stop, apologize to the guests, cleanse myself, then continue with what I was doing. That's the best I have for you. I hope it helps.