Done this a couple of times, but depends where about in port you want to go. once you get onto footscray rd, there is a bike path on the right hand side heading towards docklands. keep on this footscray rd changes to harbour esp, stay on the bike path, there is a bike / pedestrian bridge across the yarra, cross it, and from the you should find lorimer st. not my neck of the woods, but have used it. might pay to give it a run on a weekend in case you get lost.
one rotation at a time