Underarm waxing

I hate shaving and I hate hair. My armpit hair grows so fast so I normally need to shave everyday which constantly irritates my skin. I am going to Jamaica in June and planned on getting my armpits waxed but I am way nervous. I have heard it can hurt. Bad. Now I am usually good with pain. I have 11 tattoos and 2 of them are on my rib age. I am also currently going through laser tattoo removal which is far from pleasant but I deal with it. So on a scale of 1-10 what am I in for? 

P.S. I am also getting a Brazilian beforehand which I have heard isn't too terrible. That I am definitely doing for the Au naturale beach!