Take the pit out of the avocado and clean it off. Next, insert 3 tooth picks 1/4 inch in evenly around middle pointing outwards. then, put the pit over a small cup or bowl filled with water so the pit is balenced over the cup half submerged. Plant the pit when the avocado plant is 1/2 inch big.
I did this 2 years ago and my avocado plant is 5 feet tall!