Quote from traderlux:
before you place the trade, think of the exit boot that kicks you out
exit b.o.o.t.
best, what profit you would really like to get
ok, what profit you would be happy to settle for
ouch, what loss can you survive
time, when do you have to get out
Having target often means you will see the profit evaporates or turns into loss. The only reason that might make senses is ask yourself, will you buy at the current price or not assuming you have no position at all ? If answer is no, then close your position right away regardless if you have a profit or loss. Of course it is always easy to say than do.