The easiest way I found was get Disk copy 6.4, plug your new drive in (temporarily) via a firewire box, launch from an OS 9.1 or higher install CD (make sure you can get at Disk copy 6.4 via network or a small second partition on your new drive). Run disk Copy and choose clone from the utilities menu - choose your old drive as the source and your new drive as the destination and press OK. 25ish minutes later you have an exact clone of your original drive (mine was approx 4Gb copied onto a new 30Gb) which was then swapped into the powerbook. - no disc images required, no ASR, but not suitable for large scale cloning I'd guess.

Where can I find Disk Copy 6.4. My OS 9.2.1 CD only has Disk Copy 6.3.3