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Learn PolishHi Ania,
Not sure what "digraph pronunciation" is...
Do you mean ś ć ź ź ć ą ó ń ? If so, no, Poles do not have any problems with pronouncing them.
These are normal sounds the only difference was that the latin alphabet did not have these letters/sounds so they had to create them. But yes, they as easy to pronounce as other letters.
digraph = the combination of two letters reprsenting one sound such as /rz/ or in English /ph/