I'm going to warn you off YouTube AE tutorials. They're frequently of questionable in quality, and oftentimes downright misleading. You're better to nose around the Adobe Web site and search for links.
To answer your question, you used the wrong keyframe assistant. Use Easy Ease IN, not out. Here's the logic -- you're moving OUT of the starting keyframe and INTO the next keyframe.
It will also help to learn about the Graph Editor. It's easy to search for that term on AE's Online Help.
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