I don't know if it's harder but when you're playing a real person you want to honor their memory - even if they're a criminal or someone that the public loathed. That can be challenging.
My mum has never wanted me to have children. She thinks I would be destroying my life, even now.
Mankind are divided into sects, and individuals think very differently on religious subjects, from the purest motives; and that gracious common Parent, who loves all his children alike, beholds with approbation every one who worships him in sincerity.