Getting the lab layout correct has been an issue that consumed a lot of time.
If you are able to get a copy of nsx then give a bit of thought to lab setup as most of the documentation follows a similar pattern of subnets, 192.x for the hosts and 172.x for the vms. This diagram (based on the design guide, HOLs and popular lab blogs) will help you follow along without having to do nat in your head. (hey it’s difficult enough..)
These are vms created at the top level, its the starting point from which you deploy nsx.
See the post dvs switch layout for details on the networking