1st - search these forums - lots of info (and arguments) on partitioning, multi-booting, etc.
2nd - read Partition HOWTO - excellent reference on patrtioning - and the various multiboot HOWTOS (check them at the Linux Documentation project). BTW, the latter is an excellent source of Linux info for newbies. Another favorite resource is Running Linux, published by O'Reilley.
Personally, I've tried both ways (letting mandrake do the partitioning or partitioning first with PartitionMagic) and don't find much difference. Removing a distro after you've tested it could be done by just installing the new distro right over it - they generally ask you what partitions to install in (if the drive has already been partitioned), and overwrite the previous contents.
Good luck on your journey - it's a long but rewarding one.
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