My routine for that is about what you would expect, Coffee, listen to the track, Research it, Manually fill out as much of the tag as I can, upload to MusicBrainz, Repeat. Each album takes an hour or two. Faster if I can find a page somewhere with the whole album listing, preferably including the names of everyone involved with the album. There isn’t an easier way that I’ve found. Every few days I’ll have Picard rescan the collection in the unlikely event someone else has also worked on some of the tracks I’m working on. It does happen, not very often, but it does happen.