Look at the charts, draw a line going into the future that shows where you want the price to go (within reason, so "gently sloping up" sounds like a good starting point, maybe rising $0.50 to $1 per month). Put in Bids below the limit that you're happy with, and Asks above the limit that you're happy with. Like they say, buy low, sell high.
If enough people do this and do it consistently, the price will stabilise.
Instability is created when there's a positive feedback loop. In other words, people (or is that sheeple?) see the price falling so they panic and sell, causing the price to drop even further. Or they see the price rising, jump on the bandwagon, and cause it to rise unsustainably.
Surely it's not that hard? Have confidence in what YOU think Bitcoin is worth.
Fear and greed are strong emotions. The rational part of your brain will have a hard time controlling these two. Ever try to touch a spider?
I'm terrified of spiders. I know for fact they wont hurt me (at least the spider existing around where I live are completely harmless), but I can't for the love of my life bring myself to touch one. Take this as an counter-example when you say "surely it's not that hard?".
It is hard and knowing most people will indeed be "irrational" and "panic", it is also much more lucrative to panic yourself. This makes panicing rational in turn.
It's sad really, but it's the case.