On 23/01/2019 11:00, newshound wrote:

For a heavy mirror, either fix a temporary batten to the wall at the
bottom, or use something like a heavy pile of books to make a platform
right up against the wall. Get it level. Have someone hold the mirror
firmly against the wall while you mark up the holes. Keep the platform
in place at least until you have got the top two screws inserted far
enough to take the weight.

Don't forget the plastic inserts that stop the metal screws from digging
into the glass. I've found that its best to glue these in before
attempting to install the mirror or else they push out of the hole in
the mirror whilst installing and you can end up with metal on glass
whilst screwing in the fixing.

Alternatively much less hassle to buy a mirror with a frame and screw
the frame to the wall using a metal french cleat arrangement
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