I was just watching some of his videos on youtube yesterday. I'm inspired! I think sharpening chisels will be my downfall, I suck at sharpening my kitchen knives...So I just finished 2 days (12 hour days at that) in a handcut dovetail class with Rob Cosman (don't mean to be a name dropper, but this guy is freaking amazing at cutting dovetails). Several important things I learned.
1. The saw is the most important tool when it comes to hand cut dovetails.
2. A sharp marking gauge is almost as important as #1
3. A saw with less set (.002 versus .003 per side) makes a huge difference.
4. Sharp tools are a must.
5. Tails first - they serve as a template for your pins and they don't have to be cut absolutely perfect for that reason.
6. Practice. They're not as easy as they look.
7. When sawing your tails or pins, make sure your piece is low in the vise and perpendicular. Makes cutting perpendicular a lot easier.
I'm sure I'll think of a few more things later and I'll post some pics of the ones I cut in the class once I get back into the shop with the camera.