To invert surfaces, follow these steps: 1. Identify the surface you want to invert. 2. Use a tool or software that allows surface manipulation. 3. Select the invert function or option. 4. Apply the inversion to the selected surface. 5. Verify the inversion is correct and adjust if necessary.

To flip surfaces and set different textures on both sides, follow these steps: First, select the surface you want to flip. Then, use the flip command or tool in your software to invert the surface orientation. After flipping, apply the desired texture to each side separately by selecting the side and choosing the texture from your library or texture settings. Ensure that the textures are correctly aligned and adjusted to fit the surface dimensions.