The markets are dynamic and prices change with every tick. Hence it is important for a trader to have a set of well defined rules for entry and exit and the discipline to execute them.

It becomes easier to enter a trade without fear when the loss is defined at at an acceptable comfort level. Its always advisable to place a stop loss immediately with every long or short trade. If the trade is not going in your direction, take a small loss and exit the trade, else book profits without regret when the target is met. If the confidence in trade still exist, trail stop losses as required. This is ofcourse essence of being disciplined.

A trader needs to analyse his behaviour by taking a review of all trades undertaken by the end of day.

I am not aware of any web tool to manage behavior. Some traders uses systems which give entry and exit levels, which of course is another subject in itself.

Trust this is of help.