Can I start tiling in a corner?
Likewise, how do you tile into a corner?
Place your first tile into the corner, pressing its edges against the corners and the whole tile firmly against the wall. Then add a tile above it and one next to the original tile pushing them firmly into the adhesive using a twisting action.
Then, can you start and stop a tile job?
It's more difficult to stop and restart tiling then to pause and restart grouting. Grouting is usually a much faster process then laying down tile, and can often be done in one day (especially if you're working in a team like us!), but there still times when you want to pause grouting and continue the next day.
When you tile the other side of the corner, the tiles should overlap, but make sure you leave a clearance gap between them (place a spacer). Next, use caulk to fill the corner gap, as a regular grout isn't flexible and would crack in a few months.