How much does Apple charge to repair an iPhone 4s?

No warranty. I would like to know an estimate price range. I don't feel very comfortable trying to do the repairs myself.

Depends what's wrong with it. If you are within the one year warranty then you should be covered for pretty much everything except accidental damages. If you don't have any warranty then like i said it depends on whether you have a broken screen, water damage, etc… Just go to an apple store and talk to someone there, they should be able to help you out.