What is expected of a believing Muslim when an important decision needs to be made?

When an important decision needs to be made, a believing Muslim is expected to perform Istikhara. Istikhara is a prayer and a form of seeking guidance from Allah to make the right decision. The person seeking guidance should perform ablution (wudu) and offer a two-rak’ah prayer, then recite the Istikhara dua (supplication) asking Allah to guide them towards the right decision. The dua is recited with sincerity and faith that Allah will guide them towards what is best for them in this world and in the hereafter. After performing the Istikhara prayer, the person should trust in Allah's decision and act accordingly.