Yesterday was spent, resetting three areas of "Boston" pavers around the house. This rainy summer has seen some settling. Our house site is anything but flat. Two sides at one floor level, and the other two sides a story below. Pavers on three sides, I'll get to that last side "someday".
The areas were small, < 20 sq ft each. It's only the first paver lifted that offers a challenge.[=_ It's amazing how quickly a wheel barrow tray full of sand gets used up.
The outside stairs need rework every three years or so. Gravity plays with the stone base.
I swear I'm going to set those stair pavers in concrete every time they get redone. That's been about 20 years. but "next time..... ;-)
Note, the stairs are set in offset stacked wooden "frames". Each bearing on the one below. Frames are filled with pea stone to leave room for the pavers to sit flush.