Do not start tinkering yourself, you really need to get a professional to come along and give you a free quote.
When you do call an expert, make sure they are using good quality products. Some of the products do not work well around Geelong.
Get advice before you build. Often people make the mistake of building then asking us to install later. It can be impossible to get the wires into the walls and do a neat job then.
Ask before you buy equipment. I get a lot of people who go and buy stuff and waste money and then they have to ring me to sort it out. They have already opened the product and cannot take it back.