All along the watchtower isnt that easy, i watched hendrix perform it at some hippie gig and it was a trainwreck (despite the fact he was blown out of his minds on some whacked up anphetamine). I can safely say from experience that attempting goin from something semi-challenging ala 'Seek and Destroy' to a piece by a man who revolutionized rock guitar ala Hendrix in less than a month, with practically no perform experience will be a disaster in itself.
I can guarantee wen they call your name out to go and rock out, ull be as nervous as anything, ull be obsessing over wat note goes where and your timing will wreak, so yes play something easy and nail the little b a s t a r d, because i can safely say the majority of of the listening public don't give a stuff about hendrix's guitar genius enough to appreciate very simple yet effective power chords played in a steady rhythm.
Good luck and may the spirit of rock divined by our rock-God ancestors pump through the veins of ur 6-string inclined fingers