Well, last season on my Diablo we replaced just the rubber rail. So I can't give you any tips for doing the hard rail.
I ordered my rail through my local marine supply store and it was Taco Marine as well. I believe I paid about $160-$180 for about 70 feet of it. We figured out that my boat (18 ft) would use over 50 ft of it, so we had to order in the 70 foot roll. Which it is always best to have more, then to find out you are short.
For my boat:
http://www.tacomarine.com/item--1-1-...-A11-0638.html
Taco Marine Install Tips:
http://www.tacomarine.com/ccp51/medi..._TIPS_BOOK.pdf
Basically what we did to replace the rub rail was:
Before starting: Open the box, place the rub rail on a dock in pure sunlight to warm it up so it expands. Leave it there for however long you want (half hour? hour?).
1) Moved the boat into shallow water. If you have a trailer, it might be easier/harder (thinking about height, but also stability on the trailer).
2) Two people held the boat (one at stern, one bow) from bobbing around. Another person guided the rub rail into the hard rail and another fed it into the rail.
3) Remove the plate at the stern that holds the 2 sides together (dont lose the two screws).
4) Yank on the old rub rail and spin the boat around to remove it. Alternatively, have someone posted on the other side to pull.
5) Once removed, start at the stern giving yourself a bit of extra material and one person slowly feeds the rub rail into the bottom of the rub rail. Then the other person uses their thumb or a smooth piece of plastic to "pop" the top of the rub rail into the hard rail.
6) Continue along pushing towards the stern to "cram" as much material in there as possible. If you push towards the bow, you will stretch the material and possibly crack the rub rail.
7) When you reach the stern again, cut the rub rail with a knife and then lock it down with that plate and the 2 screws.
8) Grab a beer or five..
When we did ours, we basically just pushed the rub rail to where it was on the boat. We didnt really try to "cram" the rub rail to the stern, but should have. I hope it survived the winter. hehe.
Downside is when the boat would rub up against the walls inside the locks and scuff it up a bit. I was like ... nooooooooo I dont want to damage it the first time out.
Good luck doing the hard rail though. I would just follow the directions in the Taco marine and see what you come up with. Document it as well. I'am sure the other members on here would appreciate it.