What is the correct way of doing takbeer tahreemah?
In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
Takbeer-e-Tahreemah is to say Allahu Akbar at the beginning of Salah.
The method of Takbeer-e-Tahreemah for men is different from the method of women.
Hereunder is the method for men:
After making Niyyah, one should lift his two hands upto his earlobes in such a manner that both palms are facing the Qiblah and the fingers are in a normal condition, neither together nor spread out. Then he should say Allahu Akbar and fold them below the navel.
Herunder is the method for women:
After making Niyyah, she should lift her two hands upto her shoulders in such a manner that both palms are facing Qiblah and the fingers are in a normal condition, neither together nor spread out. Then she should say Allahu Akbar and fold them on the chest.
And Allah Ta’āla Knows Best
(Mufti) Abdul Azeem bin Abdur Rahman
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 مراقي الفلاح مع حاشية الطحطاوي، ج 1، فصل: في كيفية تركيب أفعال الصلاة
Taleemul Haq,pg. 75, Zam Zam Publishers