I somewhat recently installed 1.3 to a partition on my A3000. It's a little tough falling back to a far more limited shell and Workbench than we're accustomed to with 3.1, but there are tools to make your life easier.
As another poster mentioned, definitely use the GVP FaaaastPrep disk. That'll get you partitioned and formatted. It might even copy your Workbench and Extras floppies for you (I don't remember).
For my A3000, however, since I can't find a copy of the genuine A3000 Install disk, I found the install disk from the 2091 to be quite helpful. It has prep scripts and tools for the Commodore scsi.device that probably aren't too useful for your GVP controller, but it also has a script to install your Workbench and Extras disks plus additional hard drive utilities not on the regular floppies. Take a look at it (disk images are kicking around the net) or the 590 install disk (they might even be the same thing) if your GVP disk doesn't do everything.