gzt: Massey to Gt North exit > then side street park anywhere between there and Karangahape Rd > get bus anywhere there to city. That's easy every time.
Else > off at Newton rd and left to Gt North for the above or go right then right to Dominion Rd and sidestreets. I'm less certain about that one, but it's worth a look.
Edit: For uni you want the close to Karangahape Rd as you can get option. Works every time.
I'm liking the sound of the Massey to Great North Road exit option. Most of the Ritchies' buses that go out West from City always goes through there. Will explore that further. Thanks.