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You need to have addon
You need to put the addon in to your addon folder. The easiest way to do this is download the curse client (free) and then anytime you want a new addon just install it via the "Install VIA Curse Client" button.
No. But you do need 3 for frozen throne (addon) to work.
In general all you need for downloading and using an addon are WoW itself and a web-browser to download the addon from a third party site like wowinterface or curse. That said, there are addon-control packages like the curse client, which allow you to download and update many addons from a central program.
You need to put the addon in to your addon folder. The easiest way to do this is download the curse client (free) and then anytime you want a new addon just install it via the "Install VIA Curse Client" button
You will need an addon in order to move the experience bar. It is not a thing that you can do with out one.
You can go to school for it. You need to know the fundamentals of animation, such as squash and stretch, actions and key poses, planing an animation, and production pipelines.
download the addon. Should be on a zip file. Simply extract the file. place the folder with all the files in your >world of warcraft>interface>addons folder.
To begin to learn minecraft animation you need to have a look at the tutorial sites.
You need to hack the game, then detect though hundreds of files to find the animation suffix, create your animation and have the animation suffix, modify the code so your animation is played, and there you go! Hacking the game is illegal.
Pixar uses their own software called RenderMan. To get this software you have to contact Pixar about a quote or get it as an addon for Maya by Autodesk As you will see these are very expensive programs.
You could be a computer animator in games or animation, which is a good job if you have interest in it. Can be both interesting and rewarding in the long run after getting success results.