For an English speaker it would be difficult. It is a highly synthetic language (meaning the markers which tell you which parts of the sentence are doing what), compared to English which is an analytical language (meaning there are extra words like prepositions which tell you which part of the sentence is doing what). This is why Finnish (and other Uralic languages’ words) look so long to us, because where we in English would use prepositions and word order to denote object, subject etc., much of that is expressed in Finnish through suffixes.

Perhaps for a speaker of another synthetic language like Polish it might be easier to learn Finnish as their brain might would already have the wiring but even then, as the article notes Finnish is not an Indo-European language so it is further removed still.