Like oledoc says, compaction, compaction. But in addition to the #53 (1-1/2" and smaller) stone base, you'll want to top off with a couple inches of stone dust to set final grade for the pavers. You will be screeding the stone dust as you go almost like concrete to achieve a solid, flat paver base.

I think you'll find excavating to subgrade is the hardest part of the entire installation. Do you have a place on site to get rid of the excavated material? Between the stone and the stone dust, you'll be digging down at least six inches or more.

That and some Tylenol for your aching back, you should be good to go.




PS: I just looked and see in the Belgard link Erzer provided, they are using sand in lieu of the stone dust to set final grade. Either or, the same concept. But if you can get the dust delivered, it might be preferable. It will actually turn hard as stone over time.