After we removed the wall linings, it turned out that between the tiles laid on the steps and the wall there are gaps of more than 2 cm. It would be logical to glue a ceramic skirting, but on such a small amount of work (8 steps) to find a tiler for an adequate price is not realistic, I can not trim ceramic by myself too. Suggest what else you can come up with.
Buy the so-called "filler floor" , a small can. It can be tinted to match the color of the tile and fill the gap formed, you will get perfectly flat, beautiful and reliable. The basis of the filler floor synthetic resin, which has very high mechanical parameters.
You can pick up a board of the same thickness, mark it, remove the excess with a planer and "fill" the cracks with it.
You can also "foam" and cut off the excess foam with a cutter...
It would be better if you could post a photo of the "problematic unit" to give more practical advice...
Indeed, a ceramic skirting board on the tiles would be most suitable, but in your situation I suggest you consider installing a wooden skirting board. The main thing is to contrast it, for example with a dark stain, rather than just varnish it. Then it will clearly set off the tiles on the steps from the wall – this method is often used by designers. I think you can handle the wooden skirting board. You'll need a wire cutter to trim it at 45°.
To make the inside and outside corners of the baseboard look nice (even in the case of not perfect trimming), buy a sealant in the color of the painted baseboard to fill the joints with it. Before attaching the next cut piece, apply sealant to its end, apply it to the already attached baseboard and secure the piece. Pressed out of the joint excess sealant carefully remove with a spatula. This way, all corners (interior and exterior) will look perfect – the sealant will hide a possible marriage when trimming the baseboard.
To fix the baseboard, use 6x40 dowels, and instead of an impact screw, screw the 45th wood screws for drywall – they are more reliable and have a black head (will not be so noticeable on the baseboard).
To ensure that the head of the screw does not protrude over the body of the plinth, the hole is made with a drill for fixtures – it simultaneously with drilling makes countersinking for the head of the screw.
If desired, the place of screwing the screw can be closed (putty) sealant, which was used to seal the joints, so it was not a visible mount.