Taking it out is the easy part, wham slam, it's done. Getting the new one in takes a bit more finis for the reason of avoiding some redirected focus of the main beam, some call it cracking. But no matter, always glad to be of assistance.
Now if you want to preserve the old and have the new one work, then that will take a whole different set of tools and know how. It can be done, just takes a bit more time and a bit more money.