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For the former option, you can find the installer in the homebrew starter kit.
For the latter, you can find more information on yellows8's repository.
Currently, initial installation for this can only be done if you or one of your friends already has access to homebrew.
To get supermysterychunkhax, you can follow the instructions from its official webpage.
You will need to download the right otherapp payload for your console, which you can grab below on this page.
If you own a copy of Pokémon Super Mystery Dungeon, you can install Shiny Quagsire's supermysterychunkhax.
NOTE : the following steps might be slightly confusing to some people.
If you own a copy of Smile Basic, please head over to either mrnbayoh's basicsploit website (currently supports only USA) or plutoo's smilehax website (supports JPN and USA) and follow instructions there.