Use edge beading, use vertical beading (visit Homelux website to see).
Use a perpendicular cut, then sand to a 45-degree mitre (few minutes
with a Mirka sandpaper).

Mitre-butts aren't ideal, but it can avoid "an explosion of trim"
appearance depending on tile colour. Done right a mitre but shows just
the finest line of grout and appears to "wrap around" the corner if
you set/spaced tiles correctly.