I have many years experience with this and can tell you this with complete confidence... the harder the wax the greater the burn. If you are just starting out, I would STRONGLY recommend the tall glass "religious" candles. They usually have the softest wax (to test, try pressing your finger into them without even lighting them, you will see what I mean). And, in fact, use your fingers first, with any candle. If it is too hot for your finger it is DEFINATELY too hot for your body. Then, after you dip your finger in the hot wax, test that warm (but cooling) wax on your body via your fingertip. Work your way up slowly. Then, and only then, you will be able to determine what you can take very safely and easily. Wax can be fun but unless you have an extreme tolerance for pain I would stay away from harder wax candles.