Woodcutting is a very simple process:

• 
  Either make, buy, or find a hatchet to chop trees with.
  
• 
  Use your hatchet with the tree to get wood.
  
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  Remember that it may take a few tries to do so.
  
  1. 
     As you get wood you could use a tinder box and also raise your firemaking level.
     
  2. 
     You gain 61.5XP from each tree you chop down.