Fill in Artist, Album, Year, Genre, Comment, Click Save
Select all the tracks for each disc, enter disc number, Click Save, repeat for each disc
For each track I fill out Title and Track, click Save
I suggest that when saving for a single track, that after the save that the next track in the list is highlighted and the cursor placed in the Title text box
Fill the TITLE field in the main window (column view) instead of the tag panel. Click into a field, write your desired value, press enter. The value is saved automatically and the cursor will jump to the same field of the next track.