Very easy to build - just follow an online video. It's like building adult legos. Super satisfying but will take an afternoon with installations. I love
https://ninite.com/ for installing many pieces of software at once.
Hardware wise, I'm not 100% up to date on price versus performance but it all looks decent.
Definitely consider switching your power supply to a modular or semi-modular PSU. It saves a lot of headache and looks much nicer. Looks like your total build wattage is around 550 (?) so make sure you have this calculated and accounted for.
You should heavily consider a water cooler for your CPU.
This mid tower case is very large compared to your current compact choice of MOBO and PSU, easily able to downscale it if you chose.
Make sure you treat yourself to a 144 hz + 1080p or above monitor and get good peripherals (big mousepad, nice mouse, mechanical keyboard, headset/mic)
Good luck!