Curtain rails and blinds: the first ten minutes is all measuring
Curtain work is 80 percent measurement and 20 percent drilling, and the mistakes all happen in the first part. The technician has to establish three things before a single hole is made: whether the fixing is face-fix (into the wall above the window), ceiling-fix (up into the slab), or inside the recess; whether the ceiling at that point is actual concrete slab or a suspended gypsum ceiling with a void above it; and how much the finished curtains will weigh. A double track carrying blackout plus sheer across a three-metre villa window is a genuinely heavy, constantly moving load, and it needs brackets every 60-80 centimetres, not just one at each end.
Time budget: a straightforward single rail or roller blind is 30-45 minutes per window; a ceiling-fixed double track with careful levelling runs closer to an hour. The finished check is simple: the rail is dead level (water finds crooked rails instantly, your eye takes a day), gliders run end to end without catching, and the brackets do not flex when you draw the curtain briskly.