I agree in theory but in practice I'm not that precise - I either get into the trend because its a trend or stay out of the trend because its not actually a trend anyway.another really good way is to determine the probability of a move.......then you will know whether there is a lot to go or only one more swing.
this is for more advanced traders
I do pay attention to two types of TA warning signals though that might keep me out of a good trend - one is when my chart for XXX/YYY says buy but all the other XXX/ pairs say sell - the other is if price in a trend is intra-day testing the prior swing high/low.