Books of AIOU are usually good, I guess you won't face a problem about books if you are doing it from AIOU.
Regarding difficulty, it depends upon your previous education. Generally students having average English skills or those who have studied in English medium throughout find English easier than Urdu. (Masters and beyond)
P.S
I am neither M.A English nor AIOU student. If someone has more accurate information he can come forward.
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