Hello,
what kind of difficulties?
Documentation about IIS is complete: you don't need to use URL Rewrite, https://docs.moodle.org/33/en/Internet_Information_Services#URL_rewriting, if you can access the registry, https://docs.moodle.org/33/en/Internet_Information_Services#Optional_UTF-8_file_name_fix.
HTH,
Matteo