How to install Subversion on a shared host

I’ve hosted this site and several others LiquidWeb’s shared servers for probably eight years. They are without question, the most dependable host I’ve ever used. [see update]

But LiquidWeb doesn’t offer Subversion. And I will no longer do web work without it.

For some time I’d been considering leaving LiquidWeb because the lack of svn was now hindering work on my own sites. For the same reason, I’ve had to pass them over several times when clients asked for the best website host recommendations. Then the other night, I stumbled across a discussion about installing Subversion on a shared host. Why didn’t I try that years ago?