Hey guys.. i jus got some new 17" rims for my jazz (2005 VTi GD5) wit 205/40 tyres

but it seems my car is sittin bit high at the moment, so im thinkin of lowering it. I duno much about the procedures, and how much will it roughly cost?

Do i go visit a suspension shop and get new suspension?
Can anyone recommend any good ones in Sydney?

-Cheers