Found this very well done guide:
Vanilla WoW Instances: A 10-Minute Guide
https://www.youtube.com/watch?v=DKvPWm01sPM
P.S.: all credits to SoupaSoka, not me
Do i get it correctly?
Level 60 Troll hunter with a bow (305/300) needs 9% - 1% (from +5 bow skill) - 3% (from Surefooted talent) = 5% more hit chance from equipment? (to never miss in ranged attack against 63 level mob (raid boss)).