Peel and finely chop the garlic
Peel the red onion and chop it very finely (this is a skill that takes practice, so don't beat yourself up if your squares are uneven. Most people are amateur gourmets and won't notice.)
Slice a lime into quarters (you will only need two quarters to equal a half...not everyone went to MIT)
Slice the avocados in half and remove the pit. Remove the skin and roughly chop the avocados.
Add the avocados, garlic, and onions to large bowl. Using a fork, smooth the avocado and mix the ingredients well.
When the guacamole is relatively smooth, squeeze the juice from the lime quarters and mix. Add salt and pepper to taste. Ole!