Hexagram 10, Lǚ (Treading): Line 3
履卦六三 · 天泽履 · 中文版
六三：眇能视，跛能履，履虎尾，咥人，凶。武人为于大君。
The line (Legge)
The third SIX, divided, shows a one-eyed man (who thinks he) can see; a lame man (who thinks he) can walk well; one who treads on the tail of a tiger and is bitten. (All this indicates) ill fortune. We have a (mere) bravo acting the part of a great ruler.
Small Image commentary
'A one-eyed man (who thinks that he) can see:' - he is not fit to see clearly. 'A lame man (who thinks that he can) tread well:' - one cannot walk along with him. 'The ill fortune of being bitten' arises from the place not being the proper one for him. 'A (mere) bravo acting the part of a great ruler:' - this is owing to his aims being (too) violent.
象曰：眇能视，不足以有明也。跛能履，不足以与行也。咥人之凶，位不当也。武人为于大君，志刚也。
In plain words
One-eyed yet thinking one can see, lame yet thinking one can walk, one treads on the tiger's tail and the tiger bites: misfortune. It is like a warrior trying to act as a great ruler. The third line is the only yin line in the hexagram, weak, neither central nor correct, yet in a yang place; it overrates itself and so invites disaster. The Small Image says such sight is not enough to see clearly and such walking not enough to keep pace; the misfortune of being bitten comes from an improper place; and the warrior acting as ruler has a will that is too hard.
Applying it to your situation
If you are about to attempt something beyond your abilities, this line suggests first weighing yourself honestly. Which of your strengths might you be overrating?
Position
A broken (yin) line in the third place, which is a yang (odd) place, so it is not in its proper place. Its partner is line 6; one is yin and the other yang, so they respond to each other.
If this line moves
With this line moving alone, Lǚ changes into Hexagram 1 Qián (The Creative). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·履之乾.
The hexagram
Hexagram 10 Lǚ (Treading). The Judgment: (Lu suggests the idea of) one treading on the tail of a tiger, which does not bite him. There will be progress and success.
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English text: James Legge, The Yi King (Sacred Books of the East, vol. 16, 1882), public domain, as transcribed by the Chinese Text Project. Chinese: the received text. Offered for study and reflection, not as prediction. Plain-English readings and position notes by this site.