I just got my SVX a few weeks ago and it's up for an oil change. Today my boyfriend's friend is going to show him how to change my oil since he is familiar with Subarus. We're going to Pep Boys, could someone tell me specifically what I need to buy that he will need to use (ie. what type of filter, how many bottles of oil, etc.)?

Also, should I change the trans fluid? I'm thinking I should, but I don't know if I want them to mess with it if it's difficult.
Thanks.