Before you get started, make sure the studs in the new bars are the same size and length as yours, and the threads go up far enough to tighten them up. Some of the Fly bars (maybe for the Hammer?) have different size studs, 10mm vs 8mm ?, with different length threads. Nothing worse than getting it torn down only to find out you can't tighten them up with out replacing the studs. You may need different size nuts if the new bars did not come with them. I would be tempted to use lock nuts with the nylon insert anyway.
Also, I seem to remember the Ness Fly bars do not completely cover the bushings in the triple the way your stock risers do. Some folks don't mind, but to me it looks unfinished and allows water to collect in the triple and rust the bushings.
You used to be able to get machined riser cups that gave a finished look, but I have not seen a set available in years.
The Ness Fly bars look cool with the solid risers, but I hope you're ok with the non-adjustable height and the different stance.
Every day is a good day to ride. Some days are just better than others.
2010 Cross Country
Vic Performance filter, D&D, ATW, VFC III
2006 Vegas (sold)
2003 Shadow 1100C (sold)
Various other bikes all the way back to 1968.