I'm buying small amounts every week (10-20 $) since April 2014. Sometimes I'm buying more during panic sell offs. I believe bitcoin is in early stages and its potential is enormous.

I'd like to mention that if you tweak this system by selling bitcoins gradually the cash you'll get will be lower than if you sell only when the price doubles. When you divide your 10% of BTC to 10 equal parts and sell 1st part  at 1100, 2nd at 1200 and the last part at 2000 it means that you sell your 10% of BTC for average price of 1550 instead of 2000 which is 77.5% of the price you could get if you didn't split.
Splitting to 2 parts means that you sell half of your 10% holdings at 1500 and another half at 2000. Average price you get is 1750 which is 87.5% of the price if you don't split.
The last extreme example is when you divide your 10% to 100 parts and sell them at 1010, 1020, 1030.. 2000. Average price you get is 1505 which is around 75% of the price if you don't split.
I think splitting makes sense only if you don't believe that the price will actually double at all, or when you already have plenty of bitcoins and every cashout you make gives you some real money and peace of mind.
If the cashouts are small and you don't risk much money holding bitcoins it's better to wait for the price to double or even miss a few cashouts to build your BTC value quicker.

I bought some coins at 1,6k and some more at 8k, so I'm pretty relaxed. I wanted to buy more but when the pump started I decided to wait for big dump and panic to buy at low price. Don't let the panic control you. Don't sell all your coins for shit price. Never sell all your coins.
Sell only 10% when the price doubles. If you bought cheap and the price is still very good for you just reward yourself now by selling 10% of your coins and hold the rest for better times. If you sell only 10% you will feel more relaxed with some profits in your pocket and the panic won't take control of you.
Learn from mistakes of early bitcoin investors.
Use this simple investing system: https://bitcointalk.org/index.php?topic=345065.0

If you want to be rich by investing in BlackCoin or any other promising coin read about this simple investing system:

https://bitcointalk.org/index.php?topic=345065.0

TL;DR:
1. Buy coins for as much money as you can afford to lose
2. Wait for the price to double
3. Reward yourself by selling 10% of your coins
4. Go to point 2

If at any stage something bad happens to the coin you should still have plenty of cash.
Don't sell all your coins - don't repeat mistakes of the people who were selling bitcoins for 1$ or worse.

Good luck