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Never Buy into a falling share price. Nobody can pick a bottom. Wait for a return rally over a couple of trading weeks on LOW volumes not spikes. Don't get sucked into 10am rally's (unless your day trading) Buy into the trend in small parcels on the way back up in the afternoons.
Sure you may have missed the bottom, but at least your not loosing your hard earned.
As the SP rises set your Stop at a loss margin you feel safe with (how much can you afford to lose)
Always protect your capital.
If you get kicked out on a tree shake, you can always buy back in.
This has worked for me 90% of the time.
Just sayin