Wieczernia Paschalna z cerkwi Św. Ducha w Białymstoku

I've got some questions to native Poles: how hard is it for Polish-speaking person to understand the Church Slavonic language without preparation? And how hard is it to get used to the language?
Thank you in advance

lindos os praamentos

Zaiste ZMARTWYCGWSTAL!!!!!

Христос воскрес