I used to install a ton. This company is a great way to order parts:
http://www.ipclp.com/index.html . If you give the height and diameter, they can help spec out the size and quantity of components. If you don't install many, you don't want to end up with a bunch of extra fasteners and couplers.
A redwood would be pretty easy, just a straight shot. avoid any sharp bends, which should be easy enough, and I always place the conductor on the side opposite the house, if possible.
Fencing pliers are my favorite tool and the only one I use. You can use it to drive fasteners and clamp the conductor to them. Pre install the air terminal on the conductor on the ground ( I prefer the blunt Bartlett tip), along with a couple fasteners placed close together. Putting those couple fasteners on the conductor on the ground will make it a lot easier to hang it in the tree after pulling it up the whole way. That's the hard part. after that, just descend and install fasteners every 3-6 feet or so. You'll develop a feel for how close to space the fasteners based on the twists and bends in the tree. Obviously the straighter the trunk the farther apart you can go. You just don't want the conductor super tight or too loose. I usually throw a couple extra in at the bottom because this is where it will be apt to get pulled loose.
A fence post driver will work for the ground rod but they do make one for ground rods with a slimmer barrel. A little easier to use. Ground plates can be used in rocky soil but are not as effective.