Catholic visiting an Eastern Orthodox Church

Hello! As the header says I am a Roman Catholic and I would like to visit an Eastern Orthodox service to sort of visit the other lung of the church out of curiosity but I do not want to appear as rude while doing so. One question I have is during communion can you go up to the Priest with sort of X crossed arms to receive a blessing instead? Would that be seen as rude? I ask this because people who have not received first Holy Communion in the Catholic Church do this and I assume Eastern Orthodoxy would be the same. I could be wrong of course. Thank you!