You may not be a singer, but for most people that venture to sing (even in the shower) it’s difficult to hit the high notes. Once you do, however, the voice seems to settle in on it for as long as you can hold your breath.
For those who feel that worshiping God is important, the same is true. The initial climb is is the most adverse. Maybe it’s fighting the will to make it to a worship service; or the focus to sit down and have just five minutes of actual prayer.
Once you push through, though, it’s easier to settle in that posture of grace.