I believe that “trick” is to ensure that you make a totally fresh start.
In the case that became necessary due to failure to flash all partitions, apart from the hardware considerations you mentioned, ensure that your PC has plenty of RAM and if being very cautious buy a “high capacity” cable. However a failure to flash should not be a killer.
The primary risk of bricking would occur if the script went on to lock your boorloader despite you knowing that would result in failure.
Putting it another way bricking is associated with locking not installing.
Proviso Assuming FP6 behaves the same as older Fairphones 4 and 5.
Being pedantic /e/ must be “in advance of or equal”.
You say that your bricking event was only a week ago but this post and thread indicate that it may have been difficult to be certain of some dates, idk. Install e/OS on Fairphone 6 - #33 by AnotherElk