All in or out is the best pig strategy.
Mixed with buy high and sell low = maximum tears
Please read this. I learned this lesson a few years back with my first big investment of BTC @ 10 usd and went all out around $40. I should have pulled 25% out and left with my original investment and then saved the rest. IN which case that is a substantial amount of lost return. I have not made that mistake again.
What matters is Learning from mistakes, its the hardest part as we as humans tend to repeat our mistakes.
It takes a lot to break one's belief in himself to reach that point. Our ego's are primed through life to be all important, but at the end of the day, it's often responsible for our largest repeated failings. Sometimes, it takes being crippled to tears for it to accept defeat and enter the humble path of learning.