The partitioning stage was the one aspect of the Vector install that I found weak. It just opened gparted and gave no default options to choose from (expecting users to know what to do). Unfortunately I didn't really know what to do. Various questions, such as how big the swap should be, came up.
How I solved this was I used a Debian disk to partition the hard drive (I chose to go with the separate /home partition option), and then cancelled the rest of that install. I then installed Vector choosing the "keep existing partitions" option, and everything was fine. So, if you can use another distro that has some default options for partitioning, you can partition your drive, and then install Vector using those drives.
Vector really should come up with a default option or two within the install for users who really aren't sure of what to do when it comes to partitioning the drive.