Let wax come to a complete melt before blowing out candle.
Trim your wick before each burn. (Remove the mushroom top). This can be done with scissors.
You can extinguish your candle by placing the lid on top of the jar, Letting the flame go out on its own.
When burning your candle, keep in mind the size of the room. The smaller the room, the more powerful the scent will be. The larger the room, the lighter the scent will be. Some scents are stronger than others so filling a room is not a problem.