Help rooting and installing roms on 3T,followed tutorials,and bricked 3 times already

[bobbylo]

Hi,i was wondering if someone can help rooting and installing custom roms.Just got the 3T,and went through the tutorials step by step,and still the phone gets bricked.Am i supposed to start on os 3.5.3 like the tutorial says? i managed to flash twrp and root SU 2.79.for a while twrp was not seeing files,then i did a fastboot format data.,and that unencryted the phone.Tryed flashing no-verity-opt-encrypt-5.0,and that did'nt work..tryed flashing RR and got an error.i've been using a samsung galaxy s5 for the last 2 years flashing roms,it was so easy...what am i doing wrong??? I would appriciate and help,Thank you