Getting my first ever piercing!

Hi! I'm getting my ears pierced on Sunday and I have no clue what to expect, specifically in the healing area

Is there anything in particular to avoid?

and, more than anything, how does one sleep? Because I struggle with back sleeping and am much more of a side sleeper, which I understand is an issue with piercings

if you have any wisdom, even just the basics, please share because I am so incredibly unsure what not to do