If you plan to add some text, then beginner skills are enough. If you want to change colors, add new complex shapes and seamless background patterns, you need intermediate skills. Please consider that the features that a format supports are also important. With layers and separate shapes, you can easily access various elements. If the file does not support layers, like PNG or JPG, you need to select the areas or colors you want to modify. This task may be challenging – it depends on the design complexity and layout.