Use the FBSD Boot manager. It will allow you to boot into any *primary* partition (doesn't matter what filesystem - ntfs - fat32 - ext2 -whatever). Back in my experimental days when I only had one computer to mess with, I'd create my Win98 and Win2k partitions as primaries with partition magic. Then I'd install FBSD and it's boot manager would handle all of the OS's on my computer without a problem.
My real suggestion though: Get more than one computer, even a pentium will run FBSD well enough for you to mess around with it. You'll learn much more if you don't have to reboot between OS's all the time.
~bex0rs