Looking at your other posts, in particular your request to conceal your earlier posts,
does not incline me to give you all that much help.
That's because the value for later readers of this site is in
the accumulated knowledge to be found in other people's posts.
My advice is simply this - use a numbered list, and say what you want to say, in a logical order.
I concur with the view of
@Rob Legat - SBPL above - that you need the advice of a lawyer
with expertise in property law (in particular, with remedying encroachments)
in Victoria.
Frankly, you've had as much free help as is reasonable.
You are well past the point of "DIY" in this matter,
and we don't (indeed, cannot) do personalised case-specific advice here.