We did it years ago sladey with a 4x4 & van, took 6 years, work holiday work holiday etc. Absolutely loved it, made some very good life long friends. Now we dream of retirement and doing it again.
I see you're 20, my wife & I were 18 & 21 when we took off

The only advise I'll give you junior is just do it, work it out as you go

When you're in Cairns say hi to the old bastard with the windsurfer