Hexagram 10, Lǚ (Treading): Line 4
履卦九四 · 天泽履 · 中文版
九四：履虎尾，愬愬，终吉。
The line (Legge)
The fourth NINE, undivided, shows its subject treading on the tail of a tiger. He becomes full of apprehensive caution, and in the end there will be good fortune.
Small Image commentary
'He becomes full of apprehensive caution, and in the end there will be good fortune:' - his aim takes effect.
象曰：愬愬终吉，志行也。
In plain words
Treading on the tiger's tail, cautious and afraid; in the end, good fortune. The fourth line is right next to the strong fifth line, a dangerous place; but it is careful and wary, so it ends well. The Small Image says its aims are carried out.
Applying it to your situation
If you work alongside someone forceful, this line suggests being careful without giving up your own aims. In such a setting, how can you be cautious and still get things done?
Position
A solid (yang) line in the fourth place, which is a yin (even) place, so it is not in its proper place. Its partner is line 1; both are yang, so they do not respond.
If this line moves
With this line moving alone, Lǚ changes into Hexagram 61 Zhōng Fú (Inner Truth). The Jiaoshi Yilin verse for this change (Chinese): 焦氏易林·履之中孚.
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.