How do i replace the heating core

There is nothing simple about this job.You can call around to different shops and get some quotes if you don't want to tackle this job yourself,see link below for R&R.You are not that far away from me(45 minutes 85 South) and there is a place here,and this is their specialty,Family Owned(over 40 years) and they stand behind their work 100%.I had them do my Truck 9 years ago(around 8 hrs 2 people),no problems since. 1 year parts and labor warranty. https://www.autozone.com/.../Toyota...Sequoia...2001.../Heater-Core/...Installation/_/P... or>>>Horace's Radiator & Air Conditioning-- 1005 W Franklin Blvd, Gastonia, NC 28052--M-F 8-5 (704) 864-4336..good luck...