Don't be nit-picky.
Don't bind others up with rules and regulations. Don't take their freedom in Christ away.
Don't take your own freedom away for the false security rules give us humans. We think that if we play the part, if we act like we are supposed to, then we are "good" Christians. This isn't God's way. It's man's way -- the way we all fall into so easily.
Remember why we are here: to love God and love others, to tell others about Jesus and bring them into His kingdom. Rules will not bring anyone into the kingdom.
Go where you're scared to go.
Go and love where the people are.
Tell them about Jesus. Don't preach rules. Rules bring death. Freedom gives life. Freedom is found in the Spirit.
Don't discount anyone. That person might need to hear from you about Jesus. Anyone can accept Him no matter how old or young, weak or strong; feeble or sharp-minded.