A feeling of uselessness

As touched on before, the simplest of tasks seems impossible. This is so hard to put in words and explain to you, because even I find it hard to understand.
I can sit here now and think I really must do xyz, or tomorrow I am going to do such and such. No worry, very confident, just like any other person. But as the time approaches so the self doubt sets in, or the overwhelming fear of doing it wrong. Two simple examples spring to mind.

The hot tap in our ensuite bathroom broke about 3 years ago (its probably 4) after about 6 months I went to B&Q and bought a replacement set. Its a 30 minute job, turn the water off to the existing taps with the simple turn of a screw on the pipe, remove existing taps by undoing the bolts, couple up new taps, turn on water. There you go, what could be easier. Well I must have picked the new plugs up 2 dozen times, even taken them as far as the bathroom but, what if it goes wrong, what if they don’t fit. The pipe might burst and I could flood the place! Yes all of those could be true and if they are you deal with it. What is even worse is sitting here typing this it seems so easy, so why can’t I go upstairs now and do the job?

Example 2 – Last summer i needed to set a fence post in some concrete at the bottom of the garden. This time I managed to go out buy the cement, come home, decide where it needed to go, dig the hole, line up the post but. Then doubt flooded my mind, was the hole deep enough and wide enough. Had i mixed the concrete properly, was it too wet, would it set. Fortunately for this task I was so far down the road I had to resolve it, which I was able to do, by calling out to my wife, who was also in the garden and just casually asking if she thought the hole was big enough to support the post and also check it was in the correct place. In this instance what I was seeking was approval that what I had done was ok.