dont be disheartened by other people's bad experiences getting jobs. when i was applying for graduate positions i got accepted to 3 different ones! i acepted a childrens hospital.
when talking to my graduate coordinator she told all the new grads that no matter what your theory knowledge is like as long as youve passed they mainly look at your personality, are you a happy person, will you make patients smile, take the job in your stride etc. the grad program is based to improve your skills and knowledge so there not trying to find out how smart you are etc!
when going for your interview try not stress out, just be yourself and just think of it as a friendly but professional chat! im sure you'll do well! i did
p.s dont think negatively from other peoples experiences you have to go in there being positive otherwise itll be reflected by your actions! and dont forget to smile