Before the Eucharist is distributed to the faithful, when my priest comes out of the Holy Doors, he says this: "Those of you Orthodox Christians who are prepared to receive the Holy Mysteries from prayer, fasting and recent confession, come forth. Those of you who are not prepared or who are not Orthodox are welcome to come forward at the end of the Liturgy for the blessed bread and a blessing." Then he says, "with faith, with love and with fear, draw near."
How many priests, whether EO, Byz Cath, or OO say something like to the congregation this before the distribution? It should be emphasized simply because so many people today think they are "entitled" to the Mysteries regardless of what their personal confession of faith actually is.
Also, if you have any doubt about whether you should commune in a parish not your own, don't commune. You will have plenty of other times to do that, but it is far better to not possibly abuse the eucharist to the point of condemnation than to risk. We will be held accountable at the Last Judgment for every time we have received unworthily.