I've been using my AE900U a lot more than I thought I would as I love it and hopefully won't have to replace the bulb for quite a while but I got to thinking since I'm coming up on 600 hours of use. When It comes time to replace the bulb is it something I can do myself or is it something you have to send it off for? I read somewhere that it's reccomend to have a professional do it. I think it was in the manual or something. What is involved? Do most people do it them selves or have someone else do it? How much would it cost me to have someone else do it?