It is not difficult to use, but it can seem a bit complicated at first if you have a lot of files. However, once you have labelled the first few, the rest will be a piece of cake.
MusicBrainz Picard allows you to edit the ID3 tags manually or, if you think that is too much work, you can access the large MusicBrainz online database, which automatically looks for the information you need to name the file. Then, MusicBrainz automatically tags the audio file and saves it with its original name.
If you think that tagging your music collection is a long and complicated task, MusicBrainz Picard will show you a new way to tag and catalog your files.