...Is it best then to check coverage almost straight away when you have placed the
tile on the wall? And then you can reset it straight away if all is ok....
Again, this is something that will develop with experience..before you start tiling a wall, you should first decide whether you intend to fix the tiles vertically level or follow the vertical line of the wall (which is unlikely to be level)...assuming the wall is vertically level and with no dips or bumps, you should be able to apply an even spread of adhesive onto the wall (back buttering the tiles as appropriate to the chosen type of
tile), then place the
tile onto the wall and with a gentle twist of the
tile, fix it in place. Do this a few times, then take one
tile off to check for coverage and if ok, carry on. Don't spread adhesive over a large area of the wall as it will start to dry out quickly and the
tile will not bond sufficiently; only spread an area that you can comfortable
tile in a few minutes..Alternatively, if you are uncomfortable spreading the adhesive directly onto the wall, back butter the
tile then fix it to the wall..The key to both methods is to achieve an even spread of adhesive on the wall/each
tile thus achieving consistently good coverage..Assuming the wall is not vertically level and has dips and bumps and it is essential the tiles are vertically level, then you first need to find the true vertical level of the wall..Using a long level, find the most vertical part of the wall that sticks out, move the level until the bubble is vertically level, then study the gap(s) between the wall and the level (you will have to repeat this process a number of times)..The gap(s) is the area that is going to need to be packed out with additional adhesive..You should then fix your first row of tiles, packing out as necessary, recheck your vertical level and if ok, fix the next row..This principle is also applicable to making sure the face of your tiles are also level, ensuring they do not bow in/out with the dips/bumps of the wall..hope this helps!