Armpit tattoo

I have an appt with my artist to get my armpit done tomorrow as an addition to my WIP sleeve. I plan on eating a protein rich meal beforehand and drinking lots of water. I sit like a champ usually, and I have a high pain tolerance. Plus, my artist said he has a numbing cream we can use if I need it. What are some tricks and advice y'all have for making the tattoo and healing process go smoothly for an armpit tattoo?

TIA <3