Laser hair removal cycle for the back of the neck to remove messy fine hairs along the hairline

I frequently wear updos, but I am very concerned because the fine hairs along the back of my neck grow out so messily and unevenly that I look unkempt whenever I see myself from behind. I have previously ruined my hairline by shaving it myself at home, making it look like it had been gnawed by a rat, so I am hesitant to touch it again. I would like to correct the line cleanly with laser hair removal at a clinic. I am curious about the recommended treatment frequency for Maypure's laser hair removal on the back of the neck. Since the hair roots on the back of the neck tend to be thick, I am wondering how painful the laser treatment is, and I would like to know how many repeated treatments are typically required to achieve a clean neckline free of fine hairs.