If the video talked about:
- migrate your photos
- install the new version of the software
- copy the catalog, previews, and backups to the new computer
- copy the preferences
- copy the preset folderS (plural)
- copy other stuff
This is a good list of things to do. However, since LR3 and LR6 do things a little differently and in a little different places, exactly HOW to do it will be a little off. For example, the presets and preferences are not in the same places; so while the concepts on WHAT to do are valid, HOW or WHERE may take a little looking for.