The path to salvation is really so simple...
When the people heard this, they were cut to the heart and said to Peter and the other apostles, “Brothers, what shall we do?”
Peter replied, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins. And you will receive the gift of the Holy Spirit. The promise is for you and your children and for all who are far off—for all whom the Lord our God will call.”
I think too often this message has been complicated by human measurements because we want to know that the person was sincere. I can't think of any conversion story in the bible where they waited around to find out if the convert was sincere or whether he/she would just keep living the same way. It was simple...repent and be baptized. Period. It's not up to us to determine the sincerity or to judge the converted life.
And then maybe we just question our own salvation. Are we doing it right? Are we doing enough? Are we reading our bible enough? Praying enough? And yet, none of those are ever listed as a condition of our salvation.