about chopping trees, learn how to use the equipment. And i recommend the splean "whale tail" or a rack as a decending device. These types are a lot easier to stop and lock off than most other devices. oh and use an electric chainsaw. It may take longer but it can be safer than petrol
I have only chopped down little tress so far but there is a big gum overhanging a nice QLD kaori pine at my place that needs taking out.