One more vote for Idefix97.
It's automatic installation will ease your experience. Pending on what SCSI controller you have installed, you will be able to boot without a CD inside the CD unit (don't count about it if using a A2091. A2090 will no recognize a CD drive at all).
Remember to change the terminators on the SCSI chain to reflect the new setup! Most CD units have a permanent passive termination hooked in. Some have a jumper on the back to disable it. All of those are passive terminators, of course. In the life of me I never saw any unit with active termination.
