Al and others have posted the 1/3 method. You buy that way over either a day or several days to obtain the position you desire. Then on a run up you sell the same way. You're not trying to sell at the absolute top nor buy at absolute bottom since at the time your buying/selling you really can't tell. By buying/selling in 1/3rds you are averaging out your position cost or gain.

The object here is not to get greedy and try to call top/bottom, rarely can this be done.

Another point made is how hard it is to time buying back in while share price is pulling back. This can feel like catching a falling knife and you an end up with your position bought and the price sitll falling. Al's advice, as I remember it, is to wait until you see volume back in moving the share price higher after a steady drop. Again in 1/3rds. You don't catch the bottom but then not caught out having bought full position while share price continues down.

Like all investing in speculative shares especially when waiting for news one hopes will take things to another level it's not easy to follow such advice. At the moment I'm 90% back into Noront, loaded up with FWR, SPQ and lighter on FNC and BMK. In actual fact I should only be 66% back into Noront since it hasn't turned and made back losses on pull back. In this case I'm relying on news shortly regarding assays on DE2 which alone should move shares sharply higher AND anything positive from DE3 or 4 much higher. *Also counting on their being a very firm bottom of $5 which hopefully won't be tested.