Just wanted to say that I wired my bars this week and was pleasantly surprised. I read all the information here and on a couple of other forums compiled it all together and it was much easier than I thought.
Here's what I did. After removing the connectors and pulling the wires out of the stock bars, I removed all the sheathing except for the top two inches. I then put heat shrink from the top all the way to about 4 inches from the end of the wires. I tucked the sheath in then heated it all the way down for a good compact bundle of wires. Then I took some 25lb masonry string and ran it thru the bars first. Use a air compressor to blow it thru or tie a small nut, drop it in and move the bars around till it comes out the center. I took the other end of the string and using a criss-cross pattern wrapped it around the exposed wires and used electrical tape to cover starting where the shrink wrap ended and spiraling down to only the string. I bought some conduit wiring lube from Lowes. I put some in the end of the bars and began feeding the bundle thru. I asked my wife to help. She began pulling the string as I pushed the wiring thru the end of the bars. Note: I started with the TBW wiring first and taped an extra length of string to pull thru with the bundle so it would be there for the controls.
When the TBW wiring got to the first sharp bend, a little tug as I pushed moved the end around the corner. Using the push/pull method, the TBW wiring was done in about 5 minutes. Right before the TBW cylinder went into the bars, I put some more lube on it, cut the second string and used a pick to pull the string out the cutout where I would start the control wiring. Then I finished seating the TBW.
Now for the hard part. I connected the string to the right control wiring as described above, put lube in the cutout for the control wiring and started pushing the bundle thru as my wife pulled using the string. Took a couple of minutes to make the sharp bend but worked as before. After making the bend, I got my wife to push the wires as I pulled the string. It takes good firm tugs to pull the second wire thru. Working together we got the right side done. It took about 20 minutes to do the right side and 10 more to repeat the process on the left. 30 minutes to wire both sides wasn't as bad as I thought it would be.
Hope that makes sense and helps someone else out. It is much easier with 2 people and being prepared makes all the difference. I believe using the heat shrink made the bundles smaller but also made them firmer allowing you to push past that first sharp bend. Using tape on the end made that part flexible to begin the bends.
Good luck but it can be done! Thanks to all who posted their experiences before.