Suggestion for Rework Station for GPU replacement and also Memory Chips

Hello

Any suggestion for a rework station and kits I should purchase to perform GPU chip replacement on retina logic boards and also memory chip replacement on Early 2015 A1502 logic board (unsuccessful attempts when using hot air station). Hoping not to spend any more than $800 if possible. I currently only have hot air station.

Also, what do i need to know or do after replacing a GPU (i know that it has to come from the same model logic board); like is there any bios work needed to make the replacement GPU get accepted by the system, or is it just a simple replace and run?

Thanks
 
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