Compare several written quotes from local installers, checking system size, panel and inverter brands, warranties, expected output and all installation costs. Look for an installer accredited by the Clean Energy Council and verify their NSW electrical licence before signing a contract. A reputable installer should assess your roof, explain likely savings without guarantees, and manage approval with the relevant network distributor, usually Endeavour Energy in Wollongong. Check recent reviews and contract terms, and consider getting independent advice before committing.