Because you may live stream from a variety of locations, here are four ways you can be sure your video image is straight and professionally composed.
Your Tripod
Ensure each tripod leg is fully extended. If you have a bubble-level on your tripod, you can ensure the tripod is level by getting the bubble directly in the center of the circle on the glass.
Vertical Lines (the best way)
Looking through your camera's screen, try to find the straight, vertical lines near the center of your view. These may be found on the sides of the podium, large furniture, wall panels, columns, organ pipes, door frames, picture frames and headstones. Line up the vertical lines of those objects with the sides of your camera's viewing frame, ensuring that they are parallel.
Horizontal Lines
Also check the "horizon" line to ensure your picture is level. This line may be found at the base of a straight wall at the floor or where a wall meets the ceiling. In a cemetery, you want the ground to appear level from left to right, but if the ground is not level, the vertical lines of monuments may be your best point of reference for getting the picture straight.
Rule of Thirds
Where should the podium be in your picture when you're live streaming?
Ideally, the focal point of your video framing should be one third (1/3) of the way from one side of the frame (or the other) AND one third (1/3) of way from the top or bottom of the frame. The photo below illustrates the concept. This one-minute video explains this rule of thirds very simply.
Notice how the priest's head is one third of the way down from the top of the frame, and about one third of the way across from the left side (at the intersection of those two imaginary 1/3 lines).