Hi there, it is indeed rather easy. Import the .png. Make a new comp. Drag it in the comp. Click the triangle in front of the layer in the comp. Click the triangle in front of 'Transform'. Go to the point in the timeline where you want the image to be 100% Go back to the start, click the tickbox in front of 'Opacity' or click drag on the 100% value an drag it to the left. I you want a bit more non linear fade (time-wise) you can click the triangle in front of 'Opacity' and mess with the curve. But then it goes from 'easy' to possibly 'completely messed up'. Hope this helps! Good luck!