How to mount my MacBook's user folder as registered user using Automator?
Okay, problem was I thought of my user folder as residing in /Users/userfolder and the URL to that folder being afp://URLofMyMacBook/Users/userfolder.

But to connect directly to my userfolder I need to tell Automator to open:


  afp://username:password@URLofMyMacBook/userfolder


without /Users/ in between. Now it works without asking me to specify the volume.

I found this out by mounting the volume manually and looking at the "Information" (Command+I).