You should use himself in most contexts, since it is the correct version of this word. Hisself is considered a substandard dialectical variant.

When should you use himself?

Himself is used when the object of a verb or preposition refers to the same person as the subject of the verb, except in meaning [sense 3]. You use himself to refer to a man, boy, or male animal. He poured himself a whiskey and sat down in the chair. William went away muttering to himself.

Is it correct to say he himself?

"Himself" here is actually an intensifier rather than a reflexive pronoun (the World Atlas of Language Structures notes that they are often identical). As such it very much belongs with the noun phrase it is intensifying ("He"), and splitting them with a comma would weaken that relationship.