I've searched threads on lens cleaning and can only find discussions about which cleaner to use etc.. I have a kit lens for a Canon Rebel XT and see dust on the inside, behind the front glass. I seem to have learned the lesson that canned air INTRODUCES more dust into a lens than it clears out. I'm rather handy with tools and devices but have never attempted to clean one of these. I loath the idea of taking it to the camera shop because when all said and paid for, it will cost me 25% what I paid for the camera to begin with.....and then it could happen again next week. Better I learn how to do it myself - especially if it happens on vacation. Are there any special tools needed beyond a very small phillips screw driver for removing the 4 screws on the back? I intend to prepare a dustless work area and wash the oil off my hands before beginning. Comments?