OpenStack (IaaS) != OpenShift (PaaS)
Getting up and running with OpenShift is pretty easy. You can either use the all in one Vagrant VM[1] or you can download the CLI[2] and run `oc cluster up`[3] to install the docker container version.
Either one doesn't give you an "HA" install (probably want a cluster for that). I regularly deliver OpenShift installs, and in most enterprise environments an HA install takes 3-4 weeks, most of which is communicating to all the silos (networking, storage, security, virtualization, etc) what the requirements are.
Disclaimer: I work for Red Hat.
1: https://www.openshift.org/vm/ 2: https://github.com/openshift/origin/releases 3: https://github.com/openshift/origin/blob/master/docs/cluster...