Thanks for all the tips. I took a couple of photos a little late in the process, but thought they might help folks here.
Installing the cables was easy. Finding the two different holes for the different cables was easy, and threading them through was pretty easy, too. The first hard part came when you start deciding on cable length.... the trick is to get the handlebars/brifters 100% set up before doing any cutting. By 100%, I mean get those cables in position, and tape em down so they don't move. As said above, you're gonna need to rotate the handlebars to check length, and you can't do that if the cables are still flopping around.
I have double-grooved handlebars, and for the tape here I am using a strong, fiber-reinforced packing or duct tape type stuff -- I find electrical tape too prone to stretching, making it kinda useless.
Because I position my brifters a little higher than most, the curvature of the derailleur cable as it exits the brifter is a little tight. It wanted to kinda stick upwards, so when I taped it down, the first thing I did was wrap the tape in a loop around the cable once, allowing me to use the tape not just to hold the cable housing down, but to be able to pull it into a particular position:
Here you can see how I used the loop above to "pull" the part of the cable housing right as it exits the brifter downwards a little to pull it closer to the handlebar groove. I know this will eventually slip back up a little, but I want to do whatever I can to align it now.
The inner groove is for the brakes, and that was pretty easy. I used the same strip of tape to hold this one down, as it didn't require any adjustment to line it up with the handlebar groove.
Cutting the brake cable housing was easy, as it is a traditional spiral-type metal casing that clips nicely with a pair of normal wire cutters. The hard part is the derailleur cables
Instead of going ahead and chopping the derailleur cables, I went all the way to one end and dissected it to see what was inside. WOW! It's a bundle of some incredibly stiff
wires, all running parallel to the cable itself.
How the hell do I cut this stuff?
My wire cutters are just rolling over the whole bundle. Do I need to clip them one at a time or something?