Well you don't want to use anything metal. You will most likely bend the original heat spreaders if they are made from thin metal.
Depends on the design of the original coolers & how they are stuck on.
I just found it easiest to flex the heatsink just enough to manage to wedge down a plastic card between the chip and adhesive. I then slowly worked my way across pushing the card through the rows of chips. As far as you manage to get something between the heat spreader the glue will release and not stick to the card. Don't rush and work your way across and don't try to rip off the the chips or break the card using too much force.
Though if your kit has screws maybe they are easier. I hope they aren't RGB, complicates things so much more. I wouldn't have done anything to such a kit at all.
A sample image of my kit with the heatsink removed. The thick pad was on the backside, there was only a sheet of glue on the chips.
Gigabyte X570 AORUS XTREME, Ryzen 7 3800X PBO boost, 3800/1900 MEM/FCLK, 18.104.22.168.66.tRFC 600 1T 1.700V
4x8Gb Kingston HX434C19FB2K2/16 3466C19 1.2V (Micron Rev.E 16nm [D9VPP])
Last edited by Nighthog; 05-13-2020 at 09:46 AM.