If you want to practice "downsizing" first, go live on a sailboat
. Not for me, but lots of folks do...my buddy lived on his 30'er for a while back in the day, and his parents lived on a 72'er in San Diego Harbor for a while too. Now the America's Cup Marina is a LONG way from being "off the grid", but out of necessity they learned to do without "all their stuff" too...
ps: They had several houses (to fall back on), but it's certainly a "different lifestyle"....and they loved it.