Help!

I need as many tips as I can get to put up moldings in this ceiling.

I have this molding at home that I thought would help me all the way. https://www.hornbach.se/p/taklist-decoflair-d1-2x2m-20x20mm/3006959/

But I've probably realized that it doesn't work well between the sloping ceiling and the wall. I estimate the slope there to be 135 degrees. Will I be able to have uniform molding in the whole room? Or do I need two different ones? There are moldings for sloping ceilings, right?

There are two normal walls in the room.

Grateful for all the help I can get.
 
  • Sloped ceiling meeting a wall in a partially renovated room, showing a challenging angle for fitting moldings; masking tape on the floor.
You have to be a bit tricky with the angles to make the ends fit right, but it can be done with it, what are you thinking about? (maybe I missed something in my own thought) To get angles over 90 degrees, you can cut off the back of the molding so it fits the angle, if you want to make it easy for yourself, cut off the entire back (straight between the two decorative edges) and be generous with glue/adhesive behind it instead.
 
Between the ceiling and the sloped ceiling, you just cut each molding at the angle/2, just like in other 90-degree corners where you cut the moldings at 45 degrees. So somewhere around 15-17 degrees will probably be the angle you should cut the moldings at, between the ceiling and the sloped ceiling.
In the lower corner between the sloped ceiling and the wall, you cut like in a completely ordinary 90-degree corner. So, each molding is cut at 45 degrees.
 
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