Re: Can not believe 5 years ago you could of bought one whole bitcoin for this much!
What's important is that I still have on my stash and that's why I'm keeping them for the longer term this time. Selling pinch by pinch every single price increase that I think is the peak. 
Oh, that's a good tactic... I'll be using the same method for the rest of my portfolio.
I've been watching the price movement in the last few days, and the only reason I didn't cash out straight away was to see if I could ride the hype train or not. So far, it's been worthwhile, but I'm also wary of buying too soon and selling too late.
There is now way of exactly buying the bottom or selling the peak. You'll most likely always get in (a little) later or out a little to early (or too late).
Define a exit strategy and execute it without hesitant when the moment has arrived. I guess that's the only way to do it. Ideally you have defined that exit already before opening a position as one tends to be emotionally attached to a position once it's opened.