Hi Tim!
Rhizome
should be easier than seeds. I've seen hops growing in plenty of dump sites for garden waste, and also next to the place where the municipality dumps the snow cleared away from roads. I think this has to be because a small piece of rhizome came with whatever was dumped there, so it seems they are quite resilient. Another advantage of rhizomes is that you're guaranteed a female plant. From what I've heard (no direct
experience, haven't been brewing beer) having a male plant close to the female you harvest from might make the beer taste "off". Apparently you want unpollinated cones.
Don't know about your specific climate, but around where I live (Sweden) hops generally seem to thrive on neglect. It's probably wise to not let it dry out too much, at least not in the beginning. Once established, it should be able to survive most things.
Bonus use: the young shoots in spring are very nice boiled and eaten like asparagus, but probably best to wait for a couple of years, so your plant can handle it.
Good luck!