Tails is a serious ass OS for those who don't want to be seen at all. It's a standalone linux system that you can clone so you can have copies hidden if necessary. It REQUIRES you to use tor / torbrowser to maintain anonymity without the average user having to screw around with settings and such. There's a BTC program, pgp keyring, encrypted messenger(s) amongst other tools. These are just the ones you'd likely use on a normal session on there, but there's tons more. Duckduckgo doesn't save search records like google yet gets similar results so its the automatic choice on tails. Also kill java (option on the browser) so scripts can't be run in the background. Also this os is configured at the start to not save ANYTHING so you have to configure your persistent volume in order to save anything, be it pgp info, text documents, etc. Considering the power of this OS, its rather easy to set up and can save your ass in so many ways it isn't funny. Always keep a copy on a stray USB stick or two.
My two cents on this, buy a laptop you don't care about and are willing to throw in a river if you have to, never install tails to the internal HDD and always always always always update it asap. Make complex, long passwords because if someone targets you knowing you use tails, a short one won't cut it and always kill java. Even in using tails, it won't keep you invisible past your words so remind yourself that if you're going so far as to use a disappearing OS, watch your vernacular as well since thats even more of a giveaway than what you may be looking at.