There is danger in the spiritual realm, as worldly spirits deceive us and lead us away from Christ. They may claim even to be the Holy Spirit. The Holy Spirit always leads us to humble submission and unity. As to sin, we have a Church to consult in such matters, and the catechism. Christ taught us in Matthew 18 that the Church is the final voice in all such matters.
You may ask a Priest about matters that you think may be sinful. He can certainly offer you good advice.