That is about right – my A and D are about 22 inches apart and the E maybe 6 inches forward of the A.

If you have a printed copy of the “circle of fifths” diagram, draw the harp “pedal diagram” symbol that pedal harpists know, next to all of the names of key signatures on that paper, beginning with middle C at the top and working your way down. Until you have your own or a rented pedal harp, those floor exercises you mentioned are also good, Try making seven banana-shaped pieces of cardboard (from empty cereal boxes or whatever you have), labeling each with a large letter name (C and F in red and black) and place them on the floor where your feet will go on real pedals eventually. As you practice studies or pieces that have a few accidentals within the music, say out loud the pedal change required, such as “B flat”, “G sharp,” ” D natural” and so on, as your foot moves onto the correct cardboard. These visual, physical, and aural clues will give your brain an advantage when you begin to use a harp with pedals more regularly.