I think llama.cpp might be easier to set up and get running.
I second this recommendation to start with llama.cpp. It can run on a regular laptop and it gives a sense of what's possible.
If you want access to a serious GPU or TPU, then the sensible solution is to rent one in the cloud. If you just want to run smaller versions of these models, you can achieve impressive results at home on consumer grade gaming hardware.
The FastChat framework supports the Vicuna LLM, along with several others: https://github.com/lm-sys/FastChat
The Oobabooga web interface aims to become the standard interface for chat models: https://github.com/oobabooga/text-generation-webui
I don't see any indication that OpenLLaMa will run on either of those without modification. But one of those, or some other framework may emerge as a de-facto standard for running these models.