Beside the fact that there is no easy access to it unless it's on a lift, you need a press or a special toot to push out the old bushing and install the new one. The alignment of the bushing is also important. I'd take it to a shop to do it, and replace both, not just one side.
I just had my bushing and arms completed today by a personal mechanic, and I watched him through the entire process and it was difficult for him to get the old bushing and arm off. It took about 2 and half hours to complete the job.