Revelation 5:6,7

6 And I beheld, and, lo, in the midst of the throne and of the four beasts, and in the midst of the elders, stood a Lamb as it had been slain, having seven horns and seven eyes, which are the seven Spirits of God sent forth into all the earth.

7 And he came and took the book out of the right hand of him that sat upon the throne.

The Lamb that was slain was Jesus. Jesus is standing in the midst of the throne. There is also a person that is sitting on the throne that Jesus took the book from. Jesus, before now, was sitting with the Father but now John sees him standing to take the book out of the Father's hand. When He takes the book and unrolls the scroll, the events written within will happen.

The Lamb contains seven eyes and seven horns. The seven horns speak of complete power and the seven eyes or Spirits sent forth means He will rule over all of the earth in the complete fullness of God.

The Lamb takes the book out of the right hand of Him that sat upon the throne.  If Jesus is the Father like some teach, Jesus is taking the book out of the right hand of Himself.  This of course is not the case because God is triune. Once again we see the trinity on or at the throne as the seven-fold Holy Spirit, the Father and the Son.