Is there way to batch edit my files, specifically the filenames to replace "&" with "and"? Thank you.
Then, with the replace action use:
Field: _TAG Original: & Replace With: and
Try not to use _ALL as the field affecting the filename. If you use iTunes or other players that read its library file through the filepath then it won't be able to find your files, so stick with _TAG and update accordingly in for e.g. iTunes (playing the file will update the filename depending on if you've got keep itunes organized in the preferences.
Check your player for how to do this.
Or go with _ALL if you're not concerned with this.