Why send someone into what can be tiger country on a first solo nav, especially from Point Cook??
There is the highway to follow, but to the East is the Lerderderg Gorge area so bugging out that way is most unwise, then to the West of the highway there is the high ground around Gordon. Both sides rough country and forest.
Why not send a solo nav in what is Victorian spring weather to Colac or suchlike? No high ground, plenty of paddock space and you can see the weather coming.