The first rule of Bitcoiners should be to never pay taxes on your Bitcoins, which implies that you should never sell them for fiat currency again, or if you do, it should be on P2P markets.

To spend your Bitcoins, spend them at places that accept Bitcoin payments. That is the ideal situation and what you should strive for.

If we manage to live solely on Bitcoin, then we have won; otherwise, we are losing.