Is there a pattern to the tile? Think about where the pattern will fall and whether you want to center any fixtures or accessories on a certain part of the pattern.
The L-shaped Jolly trim has a perforated flange that gets set in the thinset before laying the tile — no fasteners are necessary.
If the floor is in a spot prone to movement (for instance, where an addition meets the original house) consider installing a crack isolation membrane as well.
If the grout is a light color, consider sealing it to make it easier to clean. For dark colors, this is generally not necessary. Remember, even sealed grout will allow some water to pass through — this is why shower pans have liners. This also means that tile needs to be set on cement board, not drywall, anyplace where it will get wet.
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