I'm a newbie to photography and the GX7 - so please bear with me.. Does anyone have the AE/AF lock button mastered and is willing to give better instructions than the full manual has for the GX7?? I'm confused.. For example: If I were to take a picture of a sunset in A mode (F4-5ish) with the14MM Panasonic and want to focus 1/3rd up from bottom - what is the best/easiest way to use spot metering and the AE lock button to meter the sky so the pic doesn't come out over/under exposed? Any bit of help would be greatly appreciated! Thanks!