Hi I'm a 4th year now, I started this thread 4 years ago nearly. :O
Anyway, I did use the farmer, but as you're a second year I wouldn't recommend it. I also live in oldfield park, and I know if you live in the wrong area it's a nightmare, it was in my second year. The farmer takes a whole terms parking anyway and will be full by now since it's week 5.
Currently I drive up and park on North Road. It's a 15 minute walk, up hill, to uni. But if you don't want to pay parking, then it's probably your only option, as they have even started ticketing at the cats and dogs home now. Or walk to somewhere else in oldfield park to get your bus!