Have just fitted one! No problem, drill and fit a bracket at either end, (you should be given instructions). Put a piece of masking tape over the drilling locations, to stop the masonry drill bit from skidding, and drill holes VERY slowly at first until you break through the tiles. drill to the length of the rawlplug you are using, fit screw thro' the brackets, tighten screws, fit blind. The only real problem you MAY encounter is a concrete lintel, which will take a little more time. I had my blinds made, as it was not a stock size, I'm not sure how you cut one to length, but I'm sure the instruction come with the blind