Depending upon which method you use you can either place all ingredients into a blender and pulse or smash them up in a pestle and mortar or finally chop em all by hand (well, actually a knife works better!)
Use immediately or store in the fridge until use. I find it's best used on the day of making as the herbs lose their freshness and start to discolour.
Notes
Essential Tools
chef knives
chopping board
measuring tools
pestle and mortar (optional)
blender (optional)
Tips/Tricks
start with less anchovies and capers to begin with and add more to your taste
DON'T use salt as there is plenty within the anchovies and capers