Picard (the MusicBrainz program in question) absolutely needs hand holding. When I decided to do the initial run through of my library, I went artist by artist and album by album. There's a temptation to just throw everything at it. But there are enough releases and re-releases, and instances of a single song/recording being on multiple albums that it was much less headache to never try to more than one album at a time. That hand holding is a good thing in my opinion despite the tedium. There's just too much content for any automated system to reliably handle all the match collisions. Lidarr works because it more or less goes album by album too. Lidarr can do a pretty good job of screwing everything up though, so that's the one to keep separate or be very careful and test settings thoroughly. I'm still finding weird ways that lidarr has mangled stuff I'd already tagged and renamed with Picard because of a badly formed renaming format string in lidarr's settings.