1. You take this : http://www.modaco.co...-root-09072013/
It has tuturial inside. Basically you download the Y300 version, you unzip it in a folder , you power off your phone , you power it on by holding power button + volume- until you get stuck at huawei logo for an abnormally long time (it`s possible you will have to pull out the battery prior to turning on the phone after turning it off because fast boot option keeps your phone activated somehow). Then you connect the phone through usb to pc (take phone drivers or let them install by themselves prior to this) and you double click the .bat file inside the folder , after that the phone should reboot itself and you should have Team Win Recovery Project (custom recovery)
2. To get into the recovery , you hold power button + volume+ together until recovery pops up. Here you can backup your curent rom by simply clicking `backup` option. Don`t ask me about this , i never backed up anything before flashing a new rom so i don`t know more.
3. Do the wipes . You have a wipe function in TWRP that wipes all that`s needed , this includes apps and settings and stuff , but not sd-card and such. You don`t need to wipe that.
4. Flash rom , reboot. Hope i helped ... and hope i didn`t miss anything , somebody correct me if i`m wrong
EDIT : Oh , now i saw the tutorial that you used . Well if you used that and you already have a custom recovery you can skip number 1. It`s the same procedure for ClockWorkMod (CWM) if you have that instead of TWRP.
Edited by bogdanwp, 30 September 2013 - 12:20 PM.