power supply was always one of those things I could not screw up. If it's a perfect match to mobo it wlll be nice to have.
Advice: take your time removing old one. Watch screws. Have the right size tool. Take your time installing new one. With the tiny screws and I get cords where I want them, this could take me a couple hours.
GPU/CPU...you have thermal paste, rags, chisel, putty knife--that's the danger zone 🙂
I also wish you luck.