I don't know how to help with temp root as it's basically just copy and paste once you have temp root just download the RUU and the misc posted in the thread (if you don't know the thread ill get a, link) and put them on the root of your sd card. then my personal reccomendation is just do the rest from terminal emulator on your phone.
su (then allow superuser permissions
Then type the command posted in the thread (there's only one)
Then flash the RUU in hboot by turning the phone completley off (no fastboot) and holding down volume down and power at the same time a screen should come up and it will load the zip.
During the process the phone might reboot once just don't touch it. It automatically boots back up into bootloader
Sent from my Mikimized Shift! (haha get it...like minimized...but the opposite.....I should shut up..