im new and i need knowledged help.. please

Hi my name is kimberly, I have a 73 Esprit and recently while attempting to let it live again I realized i needed to replace my heatercore ( antifreeze drippin on the passanger floor board) So i have already bought the part and have a new blower to replace the old one. But i have noooooooooo clue what to do. I am really attempting to do this engine myself and this is one thing i dont know about. I know its located around the dash area panel but i dont know how to get to it or what has to be taken off or how much effort this is willing to take but no matter i am going to do it and i need as much information and advice as anyone can give me...... so thankyou for your time

Best thing to do is probably go to like Kragen, Pep Boys whatever you got, and buy a Chilton or Haynes repair manual for your car. Tells how to fix almost anything, step by step, I guarantee you will find how to change the heatercore in there. Hope this helps a little.