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Preposition for “manière”

Yes. “De” is the correct preposition to use: “d‘une manière”. The same goes for “d‘une façon”.

« C’est difficile de comprendre » never works; « C’est difficile à comprendre » is how you phrase the idea.

Last but not least, the sentence can be shortened without losing its essential meaning:

Le texte est difficile à comprendre.