People... questions are what is supposed to happen. We want our peers to ask questions. As for progression, does it matter that someone goes from feathers to e-stim? Are they being safe? Are they being sane? are they consenting to it? If the answers are yes yes and yes, let them ask questions and don't judge. All of us were new at some point.
As for the OP question... the waxplay itself... if you have the means to use a waterbath or wax warmers, it makes it easier to use without bringing fire to the bedroom. You want to pour from high. The wax will cool as it falls to the skin. If you pour to low the wax remains at melting point on the skin for a longer period of time.
things you might want, dollar store shower curtain, dollar store sheets. the wax will ruin good sheets. if you get dollar store, you can wrap the whole thing up and throw it out. You might want a dull knife. "shaving" the wax off is a nice addition to sensation play. I say dull because you don't want to have an accident with the knife while removing wax. Not to say anything about cutting or blood play, if you do accidentally cut, odds are you are going to get wax into the cut. also dependings on the bottoms skin sensitivity, some aloe for after. maybe keep it in the fridge, you can turn skin care into tempiture play going from hot to cold.
Just thoughts. If you had more specific questions, feel free to ask.