To make it permanent you will need to use Haxchi (or CBHC for autoboot), which have a built in CFW so Mocha isn't needed.
To do that you'll need to buy a compatible DS VC from the eShop.
However Mocha can be launched from HBL through the browser exploit, no DS VC needed, and it's pretty simple to install, just download and place it on your SD card like any other app.
For Haxchi there's a good guide here: https://github.com/FlimFlam69/WiiUTutorial/wiki
Parts 4 and 5 are optional, Mocha is useless unless you want redNAND, and redNAND is also more or less useless for the average user (and requires a 64GB+ SD card)