How did God create himself or herself?

God reveals His nature/character to mankind many times in the names/titles He calls Himself. However, here is a summary statement from Him:

Isaiah 46:9-10New King James Version (NKJV)

9 Remember the former things of old,

For I am God, and there is no other;

I am God, and there is none like Me,

10 Declaring the end from the beginning,

And from ancient times things that are not yetdone,

Saying, 'My counsel shall stand,

And I will do all My pleasure,'