I do think I am making this far too hard indeed. I mean I just need to spit out some stats and then trade according to this. The secret of what you say is really where you say just take the loss. Its hard to accept the money loss, it makes you think you did something wrong. In my case, I had been doing something wrong. I didn't have a plan. So the loss was not only a loss of money but also a loss of confidence. The worst part about this was that it prevented the next trade from being put on. Once again, since there was no plan, who cares what the next trade might have even been anyway as without a plan, it might have just been random anyway.
The second thing is knowing where to take your loss. You see, many of my loses when you go through my journal have been taken at the praying stage where I just cannot believe I could hold a loser for so long. First price moves against you and you don't want to take the loss and be wrong. Then price moves against you a bit more and you think you should have gotten out sooner. Then price moves a bit more and you no longer even want a BE trade, you just want a smaller loss. And then price moves against you a bit more and you get out when you finally admit defeat. And then price comes back towards your entry! LOL....
The whole point of all this is that its so important to know where your stop loss is and respect it. You need to take this loss not only because it might turn into a bigger loss if you don't, so you want to prevent that, but also because you have to be ready for the next trade, and if your loss is bigger than it should have been, I simply would not be able to put the next trade on.
So its true that this doesn't have to be difficult, but you do have to have all the fine points worked out so you're not stuck not knowing what to do.
Anyway, sounds like you're in good head space.... this I think puts you way ahead!