A few tips-
*Consider that the sizes of the stones are not always accurate - start with the part with the more important details - in that case if you don't have enough place left for the last row/column it's not such a big deal.
*Start with one of the bottom corners and use them as support for the stones.
*Try to avoid using too much sealant - it will cause the sealant to come out to the surface and you will have to spend time cleaning it later.
*Try to avoid pressing the stones too hard against the plywood - for the same reason.
*Make sure stones are straight all the time (not tilting sideways).
*Make sure stones are always exactly above the stones beneath them (to avoid shifting).
*Keep your hands clean from sealant so it won't cover the stones when touched.
*Always look at the printed page, you can mark your place every few rows.
*It is recommended to do the job in an open place or properly ventilated to avoid inhaling the sealant fumes.