Serenity, after you enable trusty-proposed in Software & Updates, if you don't want to use the command line, you can just use Software Updater.
There will be a lot of updates available that you don't need. If you want just the AMD drivers, they should be listed as:
Video driver for the AMD graphics accelerators
Minimal video driver for the AMD graphics accelerators
Catalyst Control Center for the AMD graphics accelerators
Serenity, after you enable trusty-proposed in Software & Updates, if you don't want to use the command line, you can just use Software Updater.
There will be a lot of updates available that you don't need. If you want just the AMD drivers, they should be listed as:
Video driver for the AMD graphics accelerators
Minimal video driver for the AMD graphics accelerators
Catalyst Control Center for the AMD graphics accelerators
You can disable trusty-proposed afterword.