Horticulture work before certificate iii in horticulture

Hello Community. Is there possibility of doing some casual work for horticulture or landscaping businesses without having practical qualifications like certificate iii in horticulture, mainly to experience how it would be to do the work. I am an avid amateur backyard gardener

For example, like approaching jim's gardening or some independent businesses. Or is it not allowed for some reasons like insurance etc?

I currently do not yet know driving ( yet to learn and get a licence), which is highly likely to be a drawback, but I was just hoping whether there might be a way to shadow someone who is experienced, work a bit under them and then go for formal TAFE qualification.

In western suburbs, Melbourne...