Hi Nige,
The fusees are a different breed from the later going barrel pocket watch movements (which could also include the wristwatch movements as they are generally the same, just smaller). In some ways the fusees are more awkward, in some ways easier and the verge is not that dissimilar to a lever in principle....heck, reading this back it is not helpful to you in the slightest! Have you worked on fusees at all before? If not, I'd pick up a lever & verge movement cheaply on ebay to dismantle & reassemble a few times before trying a nice watch....I ruined a couple of movements before I got the hang of it but better that than wreck a complete watch as buying interchangeable spares is not an option.