The correct way is to be absolutely still in standing before uttering the two words "Allahu Akbar". Number two, importantly, what we actually recite is key. The following is wrong: Allahu-akbar. Why? Well, the Hamza on the Alif is not being recited. The correct method and what we have to recite is Allahu 'Akbar, emphasizing on the Akbar.
Hazrat Sheikh Yusuf Bin Ismail (radi Allahu anhu) says that this Durood Shareef is the greatest mystery of Allah. It brings 100% success and happiness to the reciter. In fact, this Durood Shareef brings prosperity and favour and solves all the complex problems by the Grace of Allah. When a man recites this Durood Shareef, the Angels of AllahXpNLsI7.