How to wallpaper this wall?

[m3jappa]

We want to wallpaper this wall, it has an arch in it, I don't want it to go into the arch into the other side iykwim.

Yes I can see I could try and cut it to the arch shape but I can imagine the edges aren't perfect and I can also imagine it peeling away.

Any ideas? I thought maybe a piece of flexible Ali trim. It I can't seem to find anything which doesn't fit under tiles.

[Simpo Two]

I have similar archway and papered up to it, cutting on the angle with a sharp modellng knife. It looks fine.

Leave the paper overlapping, wait until the glue dries then trim carefully. Metal trim will look horrible.

[Sheets Tabuer]

Trim with a bare stanley blade and if you have to use edging glue, it will be fine.