Polish is a hard language to learn as an English speaker. I see it frequently in a top 10 lists for the hardest language to learn for an English speaker. If you know any slavic language, it will be a lot easier to learn it.
RE: is polish generally an easy language to learn?
no, Generally polish is harder to learn than any other Scandinavian language. i personally prefer Norwegian as it's easier to learn and is close to English...