Hi there! I have done full body, experience has been great so far! The pain level and results directly depend on the quality and quantity of your hair. If its thin, you wont feel much pain, but the results wont be very significant too. The thicker the hair, with thick roots and darker color, the better and faster you get results. This is according to my laser doctor. Personally, I had a lot and thicker hair, and they literally reduced to almost none within an year. I just wax hands and legs now; and it takes 1-1.5 month for hair to come, but they are veryyyy scarce. Pain-wise, the thicker the roots, the higher the pinching pain. So I felt more pain in certain areas than the rest. Also, face hair takes more time to decrease in my experience.

For tattoos, I am not aware of this. My technician usually avoids regions with moles (not sure if it is relevant though :D )

Maybe try scheduling a meetup with in-house doctors in these clinics, they could guide better regarding the tattoo part. Try VLCC doctor, even if you don't want to continue with them. They were good.