Guild Wars 2

I have a thief .i love the profession.I also love wvw.My problem is that im really bad at wvw with my thief.ive used every build.i watched yishis videos.lowell videos,wild bill videos they can 1v1 any one are even 1 up to 5 enemies.i cant even beat 1 on 1 even if its a up scale player.what am i doing so wrong

1.get an gamming mouse, an good pc, without those you cannot be good
2.train in heart of mists, try the combos
3. make all profesions lvl 2 and try every single weapon set in heart of mists, you will learn to counter them , and wich skills to dodge.
4. remember , those movies are always made against below average players, with high ping that cannot react , against good players they will lose even 1 vs 2.