[Q] got new g3 in mail topic

i got my g3 in mail today. looks a great phone in hand. just make sure this is the proper thing i m going to do to flash some rom. current software build is 11c. it needs to downgrade to 10b with kdz method. stump root then. install twrp recovery with flashify. then i could pick any rom i like to flash? is there anything wrong or i missed? anything i need to take care during flashing rom?

thank you for the advice.