Let it burn beautifully.
On the first burn
Allow the wax pool to reach the edge of the vessel. This gives the candle its best chance of burning evenly for the rest of its life.
Before you light
Trim the wick to about 5 mm. This keeps the flame calm and helps prevent smoke.
When to say goodbye
Stop burning once 10 mm of wax remains. Wash the vessel with warm, soapy water and let it begin another life.