I just shower beforehand and wash my hair. I do .75m on sides of hairline, 1.0m in middle of hairline. 1.5m on top of head, 2.5 on crown. I adjust my pen a lot while doing it, I don't think the scalp is a 1 size fits all thing when it comes to how thick each part is.
I bought numbing cream when I first started, but it has been useless. I don't drag the pen because that just seems like a terrible idea because of the risk of getting hair caught. I lift up and put it back down, which is why it takes 20 to 30 minutes to get full scalp coverage.
Afterwards I wash my scalp with just water and apply a moisturizing cream that I added sandalore to. I let that sit on for a few hours.
I just clean the needles with soap and water then let it air dry.