Hello Clare
Welcome to Poms in Oz.
Unfortunately it is not as simple as imagining that you can get sponsorship for a job which is not on the list of recognised skills. If your occupation really is not on the list then you run the risk that DIAC might block the attempt to obtain a visa.
Please see here:
A-Z Occupations List - Australian Skills Recognition Information
What exactly do you and your Partner do, please? Also, what qualifications and how much full time work experience does each of you have in your respective fields, please? Thirdly, how old are you and how old is your Partner?
HGV drivers are a good illustration of my reservations about your idea. Apparently it is either a skill that Australia does not need to import, or it is not treated as a skilled job. (Opinion seems to varya about what the exact problem is.) Eith way, DIAC central office have given instructions that no visas are to be illusedto would-be migrant HV drivers.
Please also see the following links:
Employer Nomination Scheme (Subclass 121/856)
Regional Sponsored Migration Scheme (Subclass 119/857)
Best wishes
Gill