>>301219679
Along with what >>301220112
says, be aware that some anons have had an awful time with the Rift S. You could consider a Quest, or waiting to see what the Quest 1.5 is like. The new Reverb G2 also looks like it could be a viable headset. 
The Index is enthusiast hardware and does not give you that much more over a Rift S/ Quest for the $600 extra it costs. Don't throw your money at it if you are one step away from being a NEET.