Curtain rail holder

This is a guide on how to properly get curtains to the wall without buying expensive and/or crappy industrial solutions.

Preparing the curtain rail holder

Needed

quadratic piece of wood, 1.5-2cm width and 15cm length
angle bracket that's not wider than the piece of wood you're using
some rubber (e.g. old bicycle tube)

Considering the distance to wall

rule of thumb: usually around 10 cm distance to wall

radiators: curtain (rail) should not be directly above it to enable air circulation
windowsill: rail should be further away from the wall than the windowsill so that the curtain can fall freely
air circulation: should not be interrupted by the curtain

Drilling the cut-out for the rail

take a Forstner-drill from the wood drill bits drawer
drill a hole that's open towards the designated upper side of the wood

Mounting the curtain rail

Don't start drilling right away! Take a pencil and a long spirit level (Wasserwaage). Mark the upper sides of where the curtain rail holders should be. Consider the following factors

Length of curtain rail

Consider in which direction the window opens. The curtain should not stop windows from fully opening.
It should generally be at least 25 cm wider on each side than the window opening.

Heigth

rail should be about 10-15 cm higher than the window niche

Drilling and dowels

The outside walls should be out of solid bricks which makes it rather easy.
choose at least a 6mm drill, depending on which dowels there are
choose a good dowel - this might be difficult