blindfolded runs are typically submitted to https://blindfoldedgaming.com/ or other leaderboards instead of the usual src page for the corresponding game, and blindfolded discussion often happens in the general blindfolded speedrunning discord (which you can find a link to on the site linked above)

a full any% run (without assist mode) has been done blindfolded with the use of a notched controller by katun, but only certain ILs have been done blindfolded without a notched controller afaik (cap, cascade, sand, lake, wooded, cloud, lost and snow).

as for the difficulties, there are many difficulties which come with playing blindfolded, and it is probably easier for you to just try a few kingdoms blindfolded to understand the difficulties instead of trying to convey them all through description