When tiling a shower ceiling, you always want to make sure that every few rows, you measure towards the back wall to ensure that you are laying the tiles parallel to it. Adjust accordingly.  That way, you won't end up with angled pieces on the last row. 

When caulking the corners on an enclosed shower, make sure that you  thoroughly clean all of the haze off first.  I recommend lacquer thinner to clean the corners because it removes pretty much everything. A clean surface ensures a strong bond  of the silicone to the wall, thus preventing leakage.  I like to use clear silicone as it blends in much better than a coloured caulk that rarely matches the tile perfectly.  That is only advisable, though, if your corners are nice and tight. 

Vinyl flooring is quick and easy to install but I do have a tip that may surprise you.  To install flooring properly around doors, you do need to cut the jams and casing.  This creates the space you need to slide the flooring under the jams.  Be sure that you put a joint between the two jams (you can see this in the picture immediately below.  Before you snap the pieces into place that you want to slide under the jam, coat the edges in vaseline.  Snap one piece in and slide it in place.  Ditto with the second piece. Easy peasy!

Although the homeowner will never see them, protector plates are an essential component of a bathroom renovation.  Whenever electrical wires or plumbing lines are at  the edge of the stud (close to the cement board or drywall), protector plates are required.  These plates prevent a screw from penetrating the wires or lines.  You can see one such protector plate in the photo.