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LOS ANGELES (AP) _ Shannyn Sossamon is getting on-the-job training when she makes movies.

``It's hard for me sometimes because I don't have any training to back up anything,'' said Sossamon, 22, who made her film debut in last year's ``A Knight's Tale.''

``That isn't necessarily a bad thing but it is hard for me sometimes because I doubt myself and that's a horrible feeling to have.''

Her latest film, ``40 Days and 40 Nights,'' also starring Josh Hartnett, is now in theaters.

``I think I'm learning a little bit after each one,'' Sossamon told reporters. ``As long as that keeps happening I think I'll be OK.''

Her upcoming films include Roger Avary's ``The Rules of Attraction'' and ``The Sin Eater'' with Heath Ledger, her co-star in ``A Knight's Tale.''