oneself / even
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oneself
Used to highlight a person or thing and emphasize that exactly this one, and no other, is meant. It means 'persönlich' (personally) or 'in eigener Person' (in person).
Der König hat die Urkunde selbst unterschrieben.
The king signed the document himself.
The position of 'selbst' in the sentence completely changes its meaning. If it comes after the word it emphasizes, it means 'persönlich' (personally). If it comes before it, it means 'sogar' (even).
Der Chef selbst hat den Brief geschrieben.
The boss himself wrote the letter.
In the meaning 'persönlich' (personally), 'selbst' is often combined with verbs of doing or creating in order to emphasize one's own effort. Typical phrases are 'selbst machen' (to do/make oneself), 'selbst kochen' (to cook oneself), or 'selbst entscheiden' (to decide oneself).
Ich backe mein Brot immer selbst.
I always bake my bread myself.
When 'selbst' means 'sogar' (even), it introduces surprising information. It stands directly before the part of the sentence that is unexpected, whether that is the subject, an object, or a time expression.
Er arbeitet selbst am Wochenende.
He works even on weekends.
oneself / each other
'sich' and 'selbst' can both appear with people, but they do not have the same function. 'sich' is a reflexive pronoun: it shows that the action goes back to the subject, for example in 'sich waschen' (to wash oneself) or 'sich etwas kaufen' (to buy oneself something). 'selbst' is not an object like 'sich'; instead, it emphasizes a person or thing. It can mean that exactly this person does something, or it can mark surprising information like 'sogar' (even). The words are confused because you can see both in some sentences, for example 'Er macht es selbst' (He does it himself) and 'Er wäscht sich' (He washes himself). Pay attention: 'sich' belongs to the verb structure, while 'selbst' only adds emphasis or surprise.
Die Chefin selbst hat den neuen Plan vorgestellt.
The boss herself presented the new plan.
David bereitet sich am Wochenende auf das Gespräch vor.
David is preparing for the conversation over the weekend.