Safest method...
Use Norton Ghost to image 9GB drive to 18GB. (Advantage is nothing on original drive is changed)
Use Partition Magic (4.0 or later) to resize the partitions to your specifications (4GB limit for VFAT and 7.8GB for NTFS on bootpartition).
I have used this method for 2 years to save hours of installation time. The safety net is that if all else fails, plug in your 9GB drives and you are back to the original configuration.
I just noticed that you want to stay away from PM. If you are convicted to avoid using it or a comperable tool, you are stuck with backup and restore, and that is about 15 minutes faster than a reinstallation.
Good Luck,
Ray