It’s not hard. Just takes patience. Generally speaking, start with just a single table.
- Run the leveling feet out about halfway, and then get that table leveled up in its final resting spot.
- Bring the next table over and set it in place beside the first table, and place a straightedge spanning across the two.
- I recommend clamping (IT) to one of the two (generally the one that is higher at the moment).
- Begin adjusting the leveling feet on the newly adjacent table until the straight edge demonstrates that they are on the exact same plane.
- With precision tables, you can also run your finger across the joint and it should be obvious the tables are level.