I'm about to buy a 2002 4Runner SE5 - 53K. I've read a few things on this forum and another about the headgaskets on the 2002. I'm not mechanical inclinded, so is there anything I need to know or can check about the headgasket before dropping my money on it? The guy selling it to me, is a very good friend from church and I'm sure would check anything out for me -- thanks for any suggestions or help.