I have done mine twice and will do them a third time this summer sometime. The service manual is pretty good. They were all in spec at 16K, 2 intake slightly out of spec at 32K, so I had to remove one camshaft and shim 2 valves. A few things I can recall.
1) If you can find an extra set of hands it makes it easier to remove and especially re-install the valve cover. You have to put some sealant on the gasket half moons and it's much easier with an extra set of hands.
2) I removed the coolant hoses from the right side (the section with the radiator cap). which makes access much better. Since you are doing that, you may as well completely drain the cooling system and re-fill with new coolant when done.
3) Unmount and tie back both coils out of the way. Be careful as some of the small wires are fragile. I didn't disconnect just moved out of the way.
4) Number the spark plug wires with a Sharpie to make sure you put them back in the right spot.
5) If you are anywhere close to needing new plugs, its a great time to replace. Access to #3 is much easier with everything out of the way.
6) if you want to reduce your downtime, order a shim kit from Hotcams. There used to be a traveling shim kit passed around the forum but it's MIA and had very few sizes.
HONDA CB900F 919 02-04 HOTCAMS HOT CAMS VALVE SHIM KIT | eBay
You will be surprised at how easy it was when you are done. The first time myself and another WT (Basspiece) did both of our bikes in about 3 hours then went for a ride and neither of us had done it before (no shimming tho).
Blood and Guts- Good times!