It is a pain but if you try to do the walls or ceiling first, let it dry and smooth it off then do the other surface. There is a plasterers float for inside corners, I have one but I've never had much luck with it.
I have seen the "corner trowel" but can only imagine the scratches I would leave. I will try with a standard filler/scraper and a sanding block
Use a sponge to feather filler rather than sanding.
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It is a pain but if you try to do the walls or ceiling first, let it dry and smooth it off then do the other surface. There is a plasterers float for inside corners, I have one but I've never had much luck with it.