Technically you can install the panels yourself. However, given the high DC voltages and currents associated with solar panels, we strongly recommend that you have your solar system installed by an accredited solar installer.
Furthermore, solar panel systems must be installed according the requirements of the Small-scale Renewable Energy Scheme in order for them to be eligible for small-scale technology certificates (STCs). These certificates can be assigned to a registered Agent (such as a retailer or installer) in exchange for a financial benefit, such as a discount off the invoice.