is it a good idea?

I found 3 licensed electrologists.I have dirty blonde hair on my head but light/medium brown hair everywhere else .I want to do brazilian underarms and legs.im also not sure where i should start first.

I would start on the underarms, legs, then brazilian. The color of your hair should not matter.

I would start with your underarm you should see improvements quicker there, the legs are going to take a long time to complete unless you go in for marathon sessions