I recently decided to get some actual blonds for my condo since I've had the paper blinds since I moved in.I measured my windows and ordered them online, thinking I could install them myself. Big mistake.I haven't got past the first bracket. I drilled holes into the wall but the screws won't go in. I don't know if it's the wall or maybe my electric screwdriver but it's driving me crazy.What am I doing wrong? Am I drilling into a reinforced portion of the wall? Is it the drywall? Do I need a better drill/ electric screwdriver? (The one I have is 7.2 volts)