If you use a chainsaw to build a house, then maybe you have no idea what tools are best for a particular project.You can also build a house with nothing more than a hammer, chisel, and chainsaw. That doesn't mean it's wise to do so. Tools automate. Proper tools automate the job at hand. Tell me if I'm wrong but AFAIK MS Word cannot automatically detect paragraph numbers and apply a style.
I'm going to agree with Zigner. What you seem to want, is to do nothing yourself, but have a machine or someone else to do all the work for you. If that be the case any local attorney will be able to help you out with your legal document formatting. It's what they are trained and licensed to do