Many churches are using projection systems to provide lyrics to songs and sermon notes to the congregation. While the software generally isn't difficult to learn or use, what's often lacking is an understanding of how to use the system well in a worship context.
What I'm about to present here is subjectiveyou may disagree with some of all of my points, and that's fine. But my hope is that this will make you think about what you are doing with your media system during services to ensure it works with how you lead your congregation in worship and teaching.
The biggest thing is to have a consistent and helpful timing in how your slides are presented.
A lot of churches will bring up the next slide for a song just as the first word is being sung. This, however, is too late.
The media person is a worship leader, not a worship follower. The congregation needs to see the words before they start to sing them. Therefore, the next slide should go up just as the last word or two on the previous slide is being sung.
Pay attention to what you are using for backgrounds, and pick them intentionally.
Pick backgrounds that match the mood or theme of the song, and backgrounds that will let the words stand out instead of causing the words to blend in with background, making them hard to read. Backgrounds should add some beauty and visual interest, but not draw attention away from the lyrics and music.
Motion vs. Stills:
Motion backgrounds can be fun, but use ones that don't create a distraction.
Slower movement is better. And honestly, they've become a bit of a fading fad. Consider moving away from motion backgrounds and use nice, tasteful, intentionally chosen still images. It doesn't have to be a photo even a nice gradient that fill the screen can work very well.
Transitions and instrumental breaks:
When there a longer break between verses, or between songs, don't leave up the last lyric slide.
Most worship media programs allow you to clear out the words while leaving the background with a simple click of a button, or put a standard logo type screen up.
I like it when the lyrics are taken off the screen for those instrumental breaks and in-between song times, and when worship is over, just going with a simple, tasteful logo or black screen during periods where there is no graphic pertinent to that part of the service available.
Being intentional about how you use your screens and thinking through how each parts of the media adds to (or detracts from!) your service can go a long way to improving the impact media has in your ministry.