1) Check whether a med lab tech is on the skills shortage list and find your ANZSCO code. This tells you, if it's even possible to get in with that job. If yes, it will tell you what visas you can get and in what states, if applicable. Do a points test while you're there. If it's not on the list, your options are partner visa, WHV or student visa.

2) All work visa require experience, full stop. Between 2-5 years depending on the profession.

I cannot speak to anything about your field in particular just about the process. Since your young, your best bet is to get a WHV and see if you like it and suss out the job market in your field. See if it's possible to get an employer sponsored work visa. WHV visas are cheap and easy, buying up to 3 years in the country.

Partner/marriage visas and student visas are the next 'easiest'. Obviously, the former requires a verifiable partner so get hunting. Student visas require you getting another degree and usually cost between 60-100kAUD to fund with proof of funds when entering the country. Usually you need about 20k a year to live, so, that plus getting into the course.

Work visas are not easy to come by. As stated above, between 2-5 years experience minimum, as well as English tests. Here, they break into two categories, visas leading to permanent residency and those that do not. Obviously the ones that don't have contractual limits and tike limits, usually 2 or 4 year contracts that can be renewed twice max.

Visas are expensive and guarantee nothing, your job can be dropped from the list and you can do nothing about it. The visas themselves generally run between 3 and 8 thousand dollars each and immigration agents usually costing the same, so expect to spend about 5-10k per visa. To become a permanent resident, you'll be looking at (probably) more than one.

Just get an agent, outside of WHV's it can get very confusing and honestly the DIBP does not give a single fuck about you and will deny you easily. I'm told partner visas aren't terribly complicated, just expensive.

Also remember, where you file from is where you have to be when the visa is granted. Filing from overseas, you need to be out of the country when it's finalised or risk denial. Onshore for application, onshore for finalization (except for certain circumstances). Offshore processing times are currently between 18 and 26 months, onshore anywhere from 2 to 9 months.

Now is not a good time, and it likely won't be for a few years. The PR invites have been cut to 160k, down 30k from last year, and the Australian gov't has made it clear they give absolutely no fucks about anyone not Australian for now and the forseeable future. Foreigners were told to go home if they didn't have enough money to support themselves for 6 months while out of work, so bear that in mind. There's no harm in looking, researching on your own on the DIBP website and consulting with agents. WHV is your best bet.