[header] How to prune an avocado tree in a pot [title] Disinfect your tools. [step] Disinfect your pruning tools (shears or clippers) in a bleach solution before beginning. A one part bleach, nine parts water solution works well. 
Let your tools soak in the solution for 30 minutes. [substeps] Since you'll be cutting into the flesh of your tree, you want to make sure your tools are free of bacteria, pests, and toxins.