I remember when you first posted that you felt called to do this, and I'm so excited for you!!! Good luck!!
I'm probably not the best person to answer your question about balance, but I've definitely gotten a lot better and calmed down a lot since I started posting here. There are still times when I get caught up in the whole "religious" side of being a Christian and the notion that unless I'm doing something church related or praying or Bible reading, etc., that God isn't pleased with me, but I keep myself in check by remembering that God has made me a steward of what He's given me to work with in life, and it's my responsibility to make the best use of it as a witness to those outside of the church. This goes along with the scripture (I can't remember the exact verse at the moment as I don't have my Bible on me, but I believe it's Galatians 3:22) "Whatever you do, do it with all your heart as unto the Lord". It reminds me that I don't have to be caught up in the whole church thing and like you said, a literal reading of Thessalonians for God to be pleased with me. Once I realized that God is pleased with me not because of my works, but because of Christ's sacrifice and the fact that no matter what I do I'm to do it with excellence whether it's washing dishes, doing homework, cleaning my clarinets, or some of the bigger things like ministering to someone in need, it helped me relax a lot more.
Sorry this post was so long, I'm really tired and rambling.
Good luck to you on your journey and may God bless and make His presence known every step of the way.