Hey folks, so I'm starting this thread cause I figure there will be a lot of people try to mod a 2/3DS Tonight to play home brew etc. I haven't done it before but precursory googling suggests its not that hard.
In general, don't do any firmware updates till you know what your doing and have a read here.
Just follow https://3ds.guide
No reason to stay offline - you'll only be banned if you play a game online before release or cheat online. 11.8 means you will soon no longer be able to download & install from CDN but that's no biggie.
An old 3DS, old 2DS, new 3DS and new 3DS XL may come on a firmware that is low enough to hack for free (11.3 or less)
New 2DS XL will not - they are minimum of 11.4
If the firmware is too high you can still do it for about $2 (hard method) or about $15 (easy method) or free if you already have a suitable DS flashcart.
If you have any questions feel free to ask me - I am a moderator and long time member of a very big video game hacking and news site, which I got in trouble for naming here once :-) (same user name)