Aaron Marino of alpha m. discusses body hair removal via waxing. First off, how to select a good place to get waxed?
Personal recommendations are a good way. Also, you could Google "Brazilian wax ________ (your location)". Go to a place that specializes in waxing rather than a place that simply offers the service along with the rest of their services.
In regard to feeling uncomfortable, a place that specializes in waxing has seen everything. Aaron paints the picture by detailing a Brazilian wax. So, they are not going to be concerned about your chest. In regard to prepping for getting your chest waxed, do not trim down before getting waxed. The wax need to have hair to set into. And as far as 'pain pills'? Man, man up!