The directions are in the walkthrough.
At I, go forward to H. Press button and door opens. Go to G, K, O.
At O, turn left-east, press button and door closes. Go back to K and then J.
At J, turn around-east, press button and door closes. Go to N, R, S (with colored numbers and dented grill), T (with grill that leads to ladder), U (with arrow), Q (with brown door), P, L, K and O.
At O, turn left-east, press button and door opens. Go forward to P.
At P, turn left-north, press button and door closes. Go back to O, K, G and H.
At H, turn around-west, press button and door closes. Go to L, K, G and F.
At F, note the lines at left of door and purple button. Go to A (with barred window).
At A, turn left-east, press button and door opens. Go forward to B and see symbols on the door and colored numbers on the wall - red nine, blue 22 and green 3. Go back to A, F, G, K, L, H and C.
At C, turn left-west, study the code with yellow squares and then turn around-east.
Do the door puzzle on room C to open door D.
Then the other direction on the other post.
You can do it - just do it slowly and with the tips given by Emily. Make a copy of the map and the directions. Then use a pencil to mark where you have been. Turn that paper as the directions you are following.