If you like Metallica give "For Whom the Bell Tolls" a try. The little repeating part before the first verse is only 6 notes played over and over at a steady pace and isn't too hard.
Just start at a slower speed until it feels like your fingers just play it without thinking. Then speed up a little at a time.
The hardest Metallica (or most bands) solo to learn is your first one. Once you learn 1-2 from someone the others tend to come easier.
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