[ovirt-users] self hosted engine migration to existsing node question

So I have a number of nodes already running and in production. My engine is sitting on a test box, and needs to be moved onto the already existing nodes. I've read all the docs, but none of them seem to address the the use of an already existing node. if I run hosted-engine --deploy on an already existing node, is it going to mess things up, or is it really just adding some additional config files, and creating a new VM? Also does it take any additional work to get the engine enabled on all of the other nodes for the HA version? thanks, -jj-