What you what to do, even if booting with safehax as squall said, would leave you with a system highly suceptible to accidental updates, that would leave you without access to your stuff, and probably with no way to softmod your console in a very long time, not to mention de inconvenience, in case someone else would touch your console.
installing arm9loaderhax is as simple as its ever been, dont be afraid for the bricked post these are from people that are following verry outdated, or non accurate video tutorials, folow 3ds.guide its imposible to have a bricked console if you follow every step to the letter.
you just have to use safehax to boot decrypt9, do crt transfer(which is extremely safe) to get to 2.1(do not skip the backup dumping when prompted), place the necesary files on the sd to install arm9loaderhax, and after its done, restore the backup previously made by the crt transfer, and done..