What you have with the "materials from the class" is a codification of "explicit knowledge" derived from someone else's "tacit knowledge". The only way to make that codification your own tacit knowledge, which is the goal of learning, is self-study, that is, reading and understanding the codified material yourself. You have to understand it for it to become knowledge.
A benefit of having a class is participation in a "community of practice". In the class you would be learning or talking about the material with others. One way to substitute, or complement, that class situation is through on-line communities such as these stack exchanges. There are currently 43 results from a "De Anima" search and 332 questions on Aristotle. You can participate in a community of practice by answering and asking questions related to De Anima right here.
Although you already have materials, codified explicit knowledge, to start a self-study, the following might be other places to look for more information:
- Look for texts on archive.org. For example, you can find there R. D. Hick's translation of De Anima. There is other material to choose from.
- Search for information in the Stanford Encyclopedia of Philosophy. Christopher Shields has an article on "Aristotle" there. The bibliography in that article is a source of more information.
- Search for information in the Internet Encyclopedia of Philosophy. There is an anonymous article on Aristotle there.
For the question "how much would I gain from self studying", this would be influenced by your own motivation within your available community of practice. Clearly a university setting offers a community of practice that may allow you to produce explicit knowledge that is professionally recognized.