How to best remove the interior wall

Good evening, I want to remove a 10cm thick interior wall made of stones and sand. Since I have never done this before, I wanted to ask for advice here. I especially wonder how to make a clean transition to the ceiling and the side walls? I have attached a [Bild]. The wall is marked in red. Best regards

1. Wall may be removed (not load-bearing or bracing?) 2. Get sledgehammer 3. Hammering

Especially I wonder how to make a clean transition to the ceiling and the side walls?

Not at all. Only later with new plaster or similar.

Good evening,
I want to remove a 10cm thick interior wall made of stones and sand.
Since I have never done this before, I wanted to ask for advice here.
Above all, I am wondering how to get the transition to the ceiling and the side walls neat?
I have attached a picture. The wall is marked in red.

Regards

1. Check whether the wall actually and safely has no structural function. That is the most important step!
2. For better transitions, you can pre-cut with a wall chaser or grinder. Check beforehand if there is electricity or water in the wall! Open windows. It will get dusty.
3. Knock off. Start at the top, work downwards. Clear debris in between to reach the lowest rows of stones.

It really isn’t rocket science. A dust mask is definitely recommended; you inhale more than you want. Possibly pay attention to eye protection, risk of splinters. Put on gloves and get started.

Wasn't a wall already removed in the middle? A house doesn't stand without any walls...

Consulted a structural engineer?

I consulted a structural engineer, everything is fine.

and the tapping/hammering with a rotary hammer with chisel?

Just give it a try. With a thickness of 10cm, a bigger hammer will certainly work as well. Try not to damage the stones; you can usually use them elsewhere again.