Ah, you may have to explain that one to me - I need to order some blinds next week and so was wondering what side would be best and had settled on right but nkw fear this may be a blinds faux pas as it's been a while since I put any up.
A guy who puts blinds up for a living said they should always go on the left, like the hot is on the left and the cold is on the right. People might not know the rule, but it makes it easier if it fits with their muscle memory, even if not.