So when you play the CDs, why not try to sing along with the chorus? If you get well - acquainted with the lyrics and the music at home, you will no doubt be able to sing out more confidently at the Kingdom Hall.
فَإِذَا أَلِفْتَ ٱلْكَلِمَاتِ وَٱلْمُوسِيقَى فِي ٱلْبَيْتِ ،‏ فَسَيَسْهُلُ عَلَيْكَ دُونَ شَكٍّ ٱلتَّرْنِيمُ بِثِقَةٍ فِي قَاعَةِ ٱلْمَلَكُوتِ .‏