My approach is to sell 1 BTC every time I get excited about the price, and transfer the funds over as a principal only pay down on my mortgage.
That way if something horrid does happen to Bitcoin, I've at least got some benefit from it. Plus it has the advantage of not telling too much in one year once and pushing myself up into a high capital gains tax rate.
Just sold one today, was excited to see the price back above $4K again!