My thoughts for what they are worth!
I bought a tape from Oxford Air Training School (some yaers back now). I found that 15 minutes per night was about the optimum time to spend listening and learning. More than 15 minutes my mind would wander and I learned little more. It took me about 3 weeks I think and required perseverance.
A few tricks to help that I came across:
E, I, S, H.
Elephants . dit
In .. dit, dit
Straw ... dit, dit, dit
Hats .... dit, dit, dit, dit
C Chase me Charlie - . - . da, dit, da, dit (Use the rhythm)
Q already mentioned
D Dad did it - .. da, dit, dit
I am sure that others can give you more.
Good luck.