How do you stay motivated with NFP?

Hello there, if anyone uses this app to help with NFP, can you share your experience with me? Currently trying to decide between the pill and charting. I love the control and communication that comes from charting, but I get exhausted dealing with mucus and temps everyday, and lose motivation halfway thru the cycle. I don't really want to go on the pill, but if I can't stick to the temp/rhythm/mucus method, I might have to. If you successfully use NFP how do you stay interested and motivated EVERYDAY to keep up? 
For some context, my fiancé and I are remaining abstinent until marriage for religious convictions. But Im looking for anyone's stories or help, so please share even if abstinence before marriage isn't your conviction. 
Thanks!