Can't say for certain that the chipped teeth won't be a problem but I don't think that it will. As for installing it yourself: I doubt that you have the tools and dial indicators necessary to do the swap yourself. There's quite a proceedure involved that includes a step by step process of installing, measuring, rotating, measuring some more, rotating the other directions, measuring some more, then checking proper mesh and backlash. Not a project for a solo first timer. I even bought a video once to help me with the process. After watching the video I took my new gears to a shop that knew what they were doing (if that gives you any indication at all). It's not as simple as replacing a part.
