This can be a pretty daunting task if you haven't done it before or don't have the right gear. It took me many years before I felt confident enough to attempt it myself. We ended up doing the whole project, including a top end rebuild, ourselves.
I'd like to share here to encourage others who might be considering the DIY approach. We used no cranes or power equipment. Just block and tackle and our boom.
The boat is a Westsail 32 and the engine was an old cast iron Yanmar 3qm30.
Here's a photo gallery of the process:
https://imgur.com/a/8A9x7O8