Newbie here starting my 1st A body and need a/c help

I work at Oreilly auto parts as one of my part time jobs and actually all the stuff is available through them, which I may do since I can use my employee discount on it. I just saw them on ebay and wondered about them. I just may replace it all with OEM which is most likely the way I'll go. If for some reason the hoses do become an issue I have a company that's local to me that can make them. Is the heater core and evaporator hard to access? Is taking apart the dash and heater box a nightmare?