I currently have Gentoo, and I want to install Fedora using the network installation process.
My current hard drive has 22GB available, so I do have enough space for Fedora.
But, the Fedora 13 installer wants to make it's own partition or format my current partitions.
I can move the Gentoo main directories to a different path so Gentoo and Fedora wouldn't be stepping on each other.
Currently I can't move my home directory to another drive (Not enough space on other drives and not enough money to buy a new drive ).
Is there a way to install Fedora using the network installation without having to format my current hard drive?

What about selecting custom partitioning and after that use custom package selection and de-select some of the packages you do not need?

As for /home partition, you can leave it on / (root) partition and then later use symlink or hardlink to point /home folder wherever you feel like.