Ubuntu :: Installing Opera From Repositories?

At the following link, the instructions do not state clearly what is to be entered where and in which order, but here is what I have done after some trial and error:-[URL]..

1. IN THE TERMINAL, enter wget -qO - [URL]..| sudo apt-key add -

2. System - Administration - Software Sources.
3. Click on the 'Other Software' tab.
3. Click the 'Add' button.
5. Copy and paste deb [URL]...stable non-free in the APT Line.
6. Click 'Add Source'.
7. Click 'Close'.
8. Click 'Reload'.

THEN BACK IN THE TERMINAL:-

9. Enter sudo apt-get update (press Enter)

10. Enter sudo apt-get install opera (press Enter)

My question is, the article also makes it seem as if Installing via repository is different to Installing via shell. Is this correct or is installing via shell just additional steps required as part of the installation from repository?