How often can I needle with a 0.5mm Dermaroller and should I use numbing cream?

I am treating laser damage with a 0.5 dermaroller at home.( Pinholes scars broken capillaries )I find it quite painful and get pin point bleeding which I'm happy with because I know I should produce new collagen. Why am I finding it painful though didn't expect to with 0.5 and can I do it twice a week as I've read or is this not right. Can I apply my Environ AVST 4 moisturiser afterwards or please tell me what I should apply thank you