Spelling won't be a problem with either language, pronunciation will (likely) not be an issue with Finnish (depends on how well you handle phonemic vowel length).

Vocabulary will be tough. There are surprisingly many Germanic loanwords in Finnish, both new and very(!) old, but most of them are not obvious until you've studied the language for some time.

Grammar will also be tough. It's not just "a bunch of suffixes".

Some people can communicate really well without being good at the language they are using. I bet you are one of them!