Wall panelling is so effective in a room and relatively easy to do. Someone told me you had to be good at maths to do something like this. There is a lot of measuring involved. I am awful at maths but still managed to do it. So if I can do it so can you!
I got my wood beading from B&Q. It is not very expensive. Measure out your panels before you buy the wood. You can decide how many panels you want and what shape. I went for rectangle panels and one smaller rectangle. https://realise4.ie/

Things you need for wall panelling:

Wood beading
Wood glue
Mitre Block
Mitre Saw
Spirit level
Frog tape
Panel pins

Wall panelling

I also painted and panelled over wallpaper. I was just too lazy to strip it off the wall. In hindsight I would have removed the wallpaper first. I measured out my panels and used frog tape as a guide.I used tech seven to glue in my panels plus panel Pins. You can buy these in a good hardware shop. I also got a mitre block . This is a life saver for this job. It was €6 in B€Q. You will get the perfect 45 degree angle with this.
I painted my walls (& wallpaper) Stiffkey Blue by Farrow & Ball.

Farrow and Ball Stiffkey blue. Painted wall panelling.

This wall panelling can also be done on wardrobes and doors. It is so effective and easy to do.

My Finished wall