i would highly reccomend the guide on xda,like you are doing. other guides may leave you with older firmware at the end of the process.
also,i think youve figured it out... dont try and use the video as a guide. follow the xda guide,but watch the video a couple times first to get an idea what it looks like and what youre doing.
rest assured,the chance of bricking is slim. the only spots where there is danger are the spots that require you to make sure the output of an adb command matches the md5 in the guide. as long as you get matches,you should be perfectly safe
if you get a different output,STOP. dont procede and someone will help you figure out what to do so you dont brick.
getting adb set up and seeing your phone is the hard part. once you get that working,its all down hill from there