This is a great instructional video on how to play thunderstruck by AC/DC on electric guitar. Thunderstruck is played mainly on B string. It is the second string as you may be aware of. First you should start with 12th fret and hit that note. Then move to 10th fret and 9th fret. Then go back to 10fret and back to 9th fret. Then you have to go 7 and then again 9 and then 5. Now go to 7th fret and then to 4 and 5. Then to 4 and 5 and again 4 and 5 and finally to 4. You can write down on these notes on paper and practice.