Buy early signs of buying pressure. A large white candle engulfing several days is a BIG indicator.
Buying after long period of narrow consolidation is a HUGE indicator.
Sell when buying pressure is exhausted - there are no more buyers.
This is the BEST way to buy with the institutions, and sell with the institutions. Everything else is chump change. Chump change will accelerate price gains for you towards the end of a trend, and alert you exhaustion is near.
75% of breakouts fail.
Sometimes though, its fun riding the waves produced by all the breakout traders.
And in general, no matter which of the above you do, stay in leading industries/companies.
Simplicity is king: buy with buying, sell with selling.
Learn the shapes.