When is it safe to buzz cut the rest of my hair? 8 days post FUE.

It is best to contact your doctor about post operative care and instructions since each doctor has a different regimen.  In general, when your scalp has healed sufficiently you can shave your head/ cut your hair.

In order to have a hair cut ı would suggest you to wait a month. In oredr to use clippers on your transplanted area, you have to wait 6 months

Usually passed 8-10 days you are safe to cut the sides and back of your head. We do recommend a bit longer to let the donor  area heal better and for the skin to contact itself back to normal.
However the recipient of your scalp (top) where the grafts have been placed should remain untouched for 4 weeks post op. 
Even though you are in the safe zone passed 14 days op you still may have scabs and you don't want to scratch them off as you may hank out the grafts themselves.
I hope this helps.