From personal experience I can tell you that a jw will be told to get them removed or no holding the holy microphone, holy toilet brush or any other such special privileges. My jw had tatt's before joining this insidious cult and had to get them removed $!$.
"...conscience issue"- come on now, we all know what a 'conscious issue' is in dubland! Simply it goes like this- a 'real' christian wouldn't do x, y or z but you can of course. If you do, we will all treat you like shit for the rest of your life but go ahead. You will be a leper in our midst.