When is the takbir of transition made after the first tashahhud? And is it made when rising from the sitting position, such that it ends before straightening up for the third rak'ah, or after straightening up?

The manner of pronouncing the Takbir when rising from the first Tashahhud to the third Rak'ah is for the worshipper to begin the Takbir as soon as they start moving, then to extend this Takbir until they stand upright. This is the view of the majority of scholars. The Malikis, however, say that one should not begin the Takbir until they have stood upright.