After this, if you want to install a custom ROM I recommend autorec
This will install TWRP (this is a backup and flash programme) which will easily backup your rom, install any custom rom. I was struggling with the installing custom rom step, with the exact same model and version you have. But this worked great for me. Depends what you are aiming to gain from rooting though.
to answer your other questions, there is a slight risk of bricking your phone if you do not follow the steps on those forums correctly. Just take it slowly, step by step.
And upon testing my IR blaster, I can confirm it is very hit and miss. Sometimes it works on mine and sometimes it doesn't. I'm using the latest Pardus rom.
Hope I have helped, I am not as technically clued up as most of the people on here but they have helped me a lot and I want to try and give back to this community for that help.