0 a person who influences a person or group and shows them how to do something successfully -- 指路人,指路明灯,舵手
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
再长的路,一步步也能走完,再短的路,不迈开双脚也无法到达。