Holy crap! I did not realise all the implications of putting a pair of curtains up.
To answer some of the questions, it's an external wall, and it's a big window, so the curtains are big too, and heavy with it. I think it's plaster and brick, but I'm just guessing.
So I need to get a wooden batten, fix that to the wall (i.e., drill holes, insert plugs, screw in), then fix the curtain rail to the batten? Can I just use any old drill or do I need something in particular?
And how important is the wooden batten part, can I defo not just fix the rail directly to the wall?