I saw this on a different website.  I thought this version was much easier than 
the ones I saw on here already.  Hope this works better for you.

[Intro] -     D, Am, C, G      (x2)

[Verse 1]

D                         Am
  Worthy is the, Lamb who was slain
C                         G
  Holy, Holy, is He
D                              Am
  Sing a new song, to him who sits on
C                             G
  Heaven's mercy seat
                         (x2)

[Chorus]

D
  Holy, Holy, Holy
Am
  Is the Lord God Almighty
C                                              G
  Who was, and is, and is to come
D
  With all creation I sing
Am
  Praise to the King of Kings
C
  You are my everything
G                    D     Am, C, G
  And I will adore You...

[Verse 2]

D                                   Am
 Clothed in rainbows, of living color
C                                   G
 Flashes of lightning, rolls of thunder
D                                                          Am
 Blessing and honor, strength and glory and power be
C                                    G
 To You the only wise King

 -[Chorus]-

[Verse 3]

D                                  Am
  Filled with wonder, awestruck wonder
C                                         G
  At the mention of your name
D
  Jesus your name is power
Am
  Breath, and living water
C                                        G
  Such a marvelous mystery...

 -[Solo/Bridge thing]-

Am,   F,   C,   G       (x2)
Yeah... 

[Chorus]:

D
  Holy, Holy, Holy
Am
  Is the Lord God Almighty
C                                                G
  Who was, and is, and is to come
D
  With all creation I sing
Am
  Praise to the King of Kings
C
  You are my everything
      G               D
  And I will adore You...
Am, C                G
    I will adore You

  -[Outro]-

D, Am, C, G *