In order to learn the secrets of the runes (symbols of some of the most powerful forces in the cosmos), Odin hangs himself from Yggdrasil, pierces himself with his own spear, and peers downward to the Well of Urn for nine days. He fasts during this time and instructs the other gods not to assist him in any way.
At the end of the ninth night he perceives some shapes on the depth of the Well. The runes have accepted his sacrifice (Odin is sacrificing himself to himself) and show themselves to him, and thus Odin is able to learn their secrets. 1
Not that this is not a great feat, but if the process might consist in going through an ordeal were a being "offers himself or herself" to the runes, overcomes or withstands the ordeal and the runes accept this sacrifice, it could look like something that others might be tempted to try.
Has any other god or entity in the Norse mythology, successfully or unsuccessfully, attempted to gain knowledge of the runes like Odin did?