Quote from BlowFish:
Seeing as the OP has not come back perhaps I can take a turn on the couch. My bigest issue is closing postions for no good reason (except that they are not ticking in my favour right now!) I guess its another mainfestation of fear. Though I am pretty sure its not fear of financial loss. I think its possibly tied in with fear of 'failure' of course intellectually I know that the only failure is not sticking with the plan and closing out the positions before I should! Foolishly I have managed to attach quite a degree of self worth to this (the whole trading endeavour) despite being pretty comfortable with most other aspects of my life.
I guess my ego is partly to blame, it probably likes to be pampered a bit by booking a profit even if it is only a few ticks. Actually I am hardly aware I am doing it anymore - the old subconcious nips in and clicks the mouse while Im not watching 
I really have tried quite hard to deal with this but for some reason there is something that resists tackling the issue. I'd really welcome any suggestions.
Cheers,
Nick.
Closing the position because it is going a few ticks against you sounds like fear. Fear of a larger loss, fear of being wrong, and a million other fears we give validity to.
Before you start a trade do you have a solid stop loss? or even a stop loss area? I hope so, but it sounds like you are closing the position before it reaches the stop or stop loss area. if so, you are second guessing the trade probably due to fear. Its ok to readjust your stops during a trade if you have new facts that support the decision. if you are doing it out of fear thats an obvious problem. if you are changing the trade parameters after the trade is on, without any new supporting info, it sounds like you need to focus on why you are doing that. Is your stop loss to big in the first place? or do you just need to occupy your mind to avoid the fear?
I try to take the trades and then set a stop loss order. Then if possible I walk away from the computer and come back every now and then to check on it. Or I pick up a book and glance over every page or so to see how its going. I know the stop will get me out if I am wrong, so I occupy my mind with other things to keep from focusing on all the bad things that could happen during the trade (of all the bad thoughts you get, how many have ever actually happened?)
Sometimes I have to babysit the computer, IB does not provide stops outside of regular market hours. Right now I am short the Euro, its going well, but I have to sit here to make sure it does not go horribly wrong. I am up a few hundred per contract and I already moved my mental stop into a profit. in my mind I have already won on this trade, now its just a matter of how much.
Its easy to get out now with a profit. the problem is if you get out just to book a profit the trade will always continue in the direction where you would have made even more money. Then even though you made money you are upset because you left money on the table. taking profits at the right point is very hard. You never know until after the trade what could have happened.
I would suggest writing the trade down before hand. Having your stop written down too. Then do not get out of the trade unless you hit your profit target or hit your stop loss. If you get worried look at the written stop loss and feel comfortable that it is correct for you. If you get panicky or scared you might also want to write down your feelings. I have learned that writing down your fears as they happen is a great way to get over them. In your mind they are huge but when you actually write them down they look stupid and childish.