Panels should be turned by supporting as much of the panel as possible. In general this means that the panel should be moved until about half of it is off the bench and supported by one hand. Then pivot the panel on the edge of the bench until it is vertical. During this process, the other hand should be supporting the other edge. Pivot until vertical. Lift and set it on the bench. Turn it around, keeping it vertical. Lift it off the bench and set the middle against the edge of the bench with one hand on each otherwise unsupported edge. Pivot the panel on the edge and slide it back on the bench.
If the panel is going to be a large one, make it on a board placed on top of your bench. Then when it is time to turn the panel, you can tip the board, set the panel together with the board on the floor. Move the board to the other side of the panel, turn the board around, placing it against the edge of the bench and raise it while pivoting it on the bench. Additional help is to have two short pieces of wood on the floor to set the panel and board on, so you can get your fingers under easily and without getting them trapped.
If you have the space and spare boards, you can place a second board on top of the panel. Make sure the panel is at the edge of the boards next to you. You can then, with the help of another person, turn the whole panel in one movement (although your arms will be in a bit of a twist). This removes the danger of the panel wobbling too much while shifting the supporting board.
A panel of any size with one or more long lines going through the panel should be made on a board, so that it can be turned without the danger of breaking any of the glass or of the panel folding along the lead lines.
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