It took me months of living with someone eating peanut-only pb to get used to it, at some point I stopped thinking about how gross it was, and then I tried ye olde sugar pb again after a year and almost gagged. You totally can get used to it.
Some quality of life tricks to make it easier:
buy multiple jars and store them upside down so gravity can help you start mixing
mix initially (if you're able) by rapidly rotating the jar in your hand (twisting your forearm), this will get you 90% of the way
finish off the mix with a knife
keep the well mixed open jars in the fridge
Some quality of life tricks to make it easier: