You have to have good peripheral vision and you have to really concentrate.
( ( ( ( You ( have ( to ( have ( good ( peripheral vision ) ) ) ) ) ) and ) ( you ( have ( to ( really concentrate ) ) ) ) ) . )
(ROOT (S (S (NP (PRP You)) (VP (VBP have) (S (VP (TO to) (VP (VB have) (NP (JJ good) (JJ peripheral) (NN vision))))))) (CC and) (S (NP (PRP you)) (VP (VBP have) (S (VP (TO to) (VP (ADVP (RB really)) (VB concentrate)))))) (. .)))
If one get's distracted, it's very easy to make a fatal mistake. 
( ( If ( one ( get ( 's distracted ) ) ) ) ( , ( it ( ( ( 's ( very easy ) ) ( to ( make ( a ( fatal mistake ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (PRP one)) (VP (VBP get) (SBAR (S (VP (VBZ 's) (VP (VBN distracted)))))))) (, ,) (NP (PRP it)) (VP (VBZ 's) (ADJP (RB very) (JJ easy)) (S (VP (TO to) (VP (VB make) (NP (DT a) (JJ fatal) (NN mistake)))))) (. .)))