Genuinely just use archinstall it's existed for like half a decade at this point
The hardest part is just understanding what you want out of your file system and wheter yuo want btfrs ext4 or xfs as your filesystems and whether you want separate root an home partitions and swap and how much spacd to alloocate to each and i dunno installing cpu microcode is just istalling one package and changing one file
Arch is harder than gentoo for a first time linux user because the arch handbook doesnt make any assumptions about the user and assumes they know exactly what they want when they dont meanwhile gentoo takes much longer to install but the handbook just gives you each thing to type hand by hand When you're partitioning your disks in arch the arch handbook doesn't give you specific commands to write like "sudo fdisk /dev/sda" it gives you a big fuck you table of partitions and tells you "you can use fdisk, gdisk, cgdisk, fuck use whatever you want just partition the damn drives"