I live on KG Rd in Nth Warrandyte - around 500m up from the bridge. At the moment I join the MYT by driving down to Beasley's nursery (cutting off the most challenging hills and around 20min of the ride). There is path at the back of the playground that joins up with the MYT.
To get to Beasley's, I've been fairly comfortable rolling down KG Rd of a morning, partly because I was leaving early enough that the traffic was light.
When I first started I turned left at the bridge, then down to the river and rolled along there through Stiggants reserve, across the bridge to the bottom of Taroona Ave, up Everard Dve towards Pound Bend, up Pound Bend road to the Warrandyte Heidelberg Rd, then down to Beasley's. There is a path (now sealed for a fair way) on teh north side of Warrandyte Heidelberg Rd to the high school, but I found the road itself is wide enough, and mainly down hill to Beasley's, that I was comfortable on it.
As I became more confident I just rode through W'dyte along Yarra St, up the hill then down to Beasley's.
You might of course already be familiar with all of this.