It is simple and easy
The bearing is held in place with one or two setscrews which you may or may not find easily. They may be painted over or covered with growth. They are probably centered and at top and or sides. A file or sand papar may help you locate them. Once found, you may or may not be able to loosen them. Regardless, it is possible to force the bearing out with them in place - I did. I used a pipe the same size as the bearing, a length of all-thread, another pipe larger than the bearing, some large washers and nuts on both ends. Use the smaller pipe to push out the bearing into the larger pipe by tightening the nuts on the ends of the all-thread. If you loosen the setscrews, you can just tap it with a hammer and it may come out that way. In fact, I would try that first - just do not overdo it.When you put in the new one, it may just push in or you might use the all-thread method or a large clamp to press it. Whatever way you do it, figure on replacing the setscrews.It has taken me longer to write this than it did to do the job. It is not rocket science.