I've learned that at baptism in the Orthodox Church, you are granted power to resist tempation.
This is not an exclusive statement that says that baptism is the ONLY way God gives grace to resist temptation.
If that's the case, what are people outside the Church, or even those who are hoping to eventually convert to Orthodoxy supposed to do when they get tempted?
Rely on the strength God gives them apart from the sacramental life of the Church. It may not be as much or as full as what the Orthodox receive in Baptism, Chrismation, the Eucharist, and the other sacramental Mysteries, but it is something. Remember, God wills that ALL should be saved and come to the knowledge of the truth (1 Timothy 2:4). Do you think He's going to restrict Himself to the sacraments He has established for us when He desires that ALL should be saved?