Black Dog pd4

I have now learned all of the rhythm guitar parts and I need now need to learn the lead guitar parts.
The first part I will work on is the lead guitar harmony played over the main guitar riff. The harmony is a 3rd apart from the main riff and these are the tabs for the riff.
As I already know the main riff this riff should be fairly simple to learn as it uses similar finger positions and is in the same timing. This will probably take around 30 mins to learn if I focus and keep playing along with the original song. This part is impertinent to the song as it makes the main riff sound even bigger than it does when this harmony is played and it is a noticeable part of the song.