We do ground rods somewhat differently here.
First of all, we have to use a 10' rod. Since our ground has a lot of rock and hardpan, this means that about half the time it is necessary to bang in two rods (at least 6' apart) the 7-8' that they'll go.
Secondly, it's dry out here. The inspectors like to see the rods somewhat away from the wall, at the roof's drip line. Every bit of moiosture helps conductivity.
We are required to use #4 (1/4") solid wire
(or larger). The wire must be within EMT all the way to the ground rod.
Finally, the inspector likes to have the rod project out of the ground a few inches, so he can inspect the proof mark that identifies the rod (so a short rod isn't just cut off, then the saw marks banged up some).
I use a demolition hammer- slightly larger than a "roto hammer", but smaller than a "jack hammer." I also use a "post pounder-" a length of pipe with handles, and a good, heavy slug of steel at the end. (Good welding class project!)
Finally, a problem I've encountered with service changes is that old buildings frequently have footings about 5' down that project out some distance from the wall. Lots of luck with the ground rod if you hit them!
