High Pitched squeak in Dryer - AMANA

Searched all of the other threads but couldn’t find answer! Electric Dryer started squeaking (very shrill) about two weeks ago. Everything else is fine. Am thinking of replacing the rollers and the idler arm. All up, all in the parts are about $40 and I figure - while I have it apart - I might as well change out all. Does anyone have any handy hints, suggestions, or warnings before I undertake this endeavor? I am handy but never worked on an appliance before…