Here’s a secret for those who want to act well “act like yourself”.  It really isn’t hard for a dentist to play the role as a tooth cleaner as it shouldn’t be for any role that fits “your character”. The key then is to find the characteristics of the role you are performing in that fit the DNA which is in you and let that stand out.  Making it your own requires you to find what is deep in you and letting it shine through said performance.  Act like yourself in a way that feels real to you and the world will see it as such too.