First of all, don't update to anything higher than this because you will lose easy methods of getting homebrew.10.1.0-27U
There are video tutorials on both. If you want themehax, Download the themehax installer use browserhax to launch homebrew and open themehax installer and press A. Let it load and then once your done. You now have themehax! Now every time you turn on your 3DS AND then HOLD the L button while it turns on, you will see wacky stuff. Dont worry, its just launching the homebrew launcher! If it dosen't load just do it again, that happened to me once! Anyways once your done that...Then "Welcome To Homebrew!"Thanks; what about themehax?