In Orthodoxy we worship God withour bodies as well as our minds. All the little details like the inscense and the candles may seem trivial, but if you go to another Church and miss them, you might notice how much all the little details add up to give you the feeling of the Church being rasied to heaven to worship with the saints and angels during the Divine Liturgy. All the bowing and prostrations help teach us to humble ourselves towards God, and to give Him the proper reverence. When the Holy Spirit decends and changes the bread and whine into the Body and Blood, we have to have our heads bowed at least, we dare not look upon that great mystery. If we were approaching a temporal king we would bow our heads in reverence, how much more when we beg the intercessions of the eternal King? Prayer makes petition and thanksgiving before God with our minds and our spirits. Fasting does the same thing except with our bodies and our spirits. Don't get to hung up on bowing at the right time and making the right motions when you come into the Church, etc., just slowly ease into things and do things little by little until they become natural and apart of you. And remember, there's no set way to do a lot of stuff. There's no rule on the exact reverence to make when you enter a Church, or exactly how and when to approach icons, a lot of it is just popular theology running along the theology of the Church, and some of it is even wrong, such as making the sign of the cross before receiving Communion. Every motion is not set out like with the Catholics, there's freedom, so don't feel like you absolutely have to do certain things a certain way just because that's what's popular where you are. The subjection of the body through kneeling and bowing should help you to reverence God in spirit, not just be an outward act, but an act that helps your mindset. If it's just an outward act, remember that it's the reverence in your heart that counts with God, and take it easy on the physical jestures until they become more natural to you slowly.