I had difficulty with it. Just know that, with practice, you will be able to play it. It comes with different speeds for everybody. I wouldn't get too hung up on it and don't try and get it perfect. A few months from now you will be playing it and every string will sing out perfectly clean.
My thought is to get it "Sort of ok" and come back to it daily and practice. Move on.
[u]Guitars:[/u] 2014 PRS Santana, 2013 PRS Paul's, 2009 PRS Hollowbody, 1972 Gibson ES-325, 2012 Fender Strat American Standard, 2012 Yamaha Pacifica, Martin M-36, Martin 000-15M, Seagull S6 Classic[br][u]Amps:[/u] Fender Blues Junior III, Boss Eband JS-10, Line 6 POD 500X, Quilter Microblock 45