I see a lot of people talking about when to sell; but I think that buying is as important if not more (obviously you but low -_-). so do you guys aim to buy the lowest low of the day/week/month/... and do you think that is riskier and/or hard to predict. do you wait for price reversals? do you follow expert advice?? please share your thoughts and your stories (successful or otherwise

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Depends on the situation, a 7-14 day lowest would be a good time to buy but try to check if its already over sold, check the reason why the price is dropping. if you plan to buy today because its the red days and price continue to drop, I suggest to wait for a little longer as hard fork is around the corner and price will continue to drop.
You really need to buy at lower price and never buy while the price reached at the pumped price, because it will suddenly dump its price due to more will be selling their holdings when price hits the goals of most investors. Waiting suggestions will benefit you if you listen to those who advise us for good and that's true fork is there, so if you waited for the exact timing price starts to pump then you can buy again and hold for long term. This goals that we have will certainly bring good results as for several months to go can be exciting but hard to have patience.