Hi,
Replacement of the auxiliary heater core is a someone big job. However, if you take your time, you should be fine.
First, you will need to evacuate Freon from the air conditioning unit. Here is a link you may find helpful for both evacuating and recharging.
https://www.2carpros.com/articles/re-charge-an-air-conditioner-system
If you look at the attachments below, I attached the directions and pictures specific to your vehicle for replacement.
I hope this helps. Let me know if you have other questions.
Take care,
Joe
See pics below.
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Tuesday, June 1st, 2021 AT 9:07 PM