Whoever vs Whomever

I, sometimes, mix up with using whoever with whomever. Here is the rule that cleared my concept :

To determine whether to use whoever or whomever, here is the rule: him + he = whoever him + him = whomever
	Examples:	Give it to whoever/whomever asks for it first. Give it to him. He asks for it first. Therefore, Give it to whoever asks for it first.
		We will hire whoever/whomever you recommend. We will hire him. You recommend him. him + him = whomever
		We will hire whoever/whomever is most qualified. We will hire him. He is most qualified. him + he = whoever

Rule 2.	When the entire whoever/whomever clause is the subject of the verb that follows the clause, look inside the clause to determine whether to use whoever or whomever.
	Examples:	Whoever is elected will serve a four-year term. Whoever is elected is the subject of will serve. Whoever is the subject of is.
		Whomever you elect will serve a four-year term. Whomever you elect is the subject of will serve. Whomever is the object of you elect.

http://www.grammarbook.com/grammar/whoever.asp