Fix a few basic things that have fallen off wall

Hi Available today? These are all probably very basic tasks for a handyman. But I am very short of time so would appreciate someone else popping round to fix these bits please. 1) The blind in my living room has fallen down and I can’t work out how to secure it back up again. 2) Same thing has happened to the thing that holds my shower head to the wall in bathroom. Both of these are because the screw no longer grips the hole. Although I also can’t work out how to attach the blind to the fasteners that attach to the wall. 3. The door handle in the bathroom needs to be screwed back on to the door but I can’t get the handle apart to get to the screw heads. Flat is about 5 mins walk from Stratford station. Thanks, Ell