The connectors are designed in such a way that it should not be possible to connect the wrong way round.
From your description I think you may have air in the pump / pipe work try removing the shower head and putting the shower hose in the bottom of the tray or bath, then turn to fully hot and let it run for a couple of minutes then repeat with the cold, if there is air in the system this should pull it through.
I am often asked “Is this a DIY job” to be honest I can’t answer that, because without knowing someone, it isn’t possible to assess their skills?
I should say that most jobs on showers although relatively easy (from my point of view) can be fiddly and an extra pair of hands, long thin fingers and the strength in your hands of an all in wrestler are a help!
The secret is, observing very carefully when thing are taken to bits, their order and orientation, taking notes and/or photos as you go can also be a help.
When you are working with electricity and water so make sure it is switched off and turned off before you start.
If you think you can do the job but aren’t just that confident, it may help to buy the part and compare it to the faulty part, you will then be able to see where the screws, wires, nuts, or washers etc. go, if then you think it is to complicated, at least you will have the part when the plumber or electrician arrives.
We will always be here to offer help and advice if you run into a problem, however it is not the same as being on site where we can get the overhaul picture, if you are still not sure, now is the time to call in a professional.
The replacement is fairly straight forward. Turn of the water and power you then have to dismantle most of the inside of the shower to get enough space to slip the old part out and the new part in.
This sounds more difficult than it actually is, however you do have to be methodical noting where screws/nuts etc. come from and what goes where and it is always a good idea to take photos as you go because you can refer to them when you are rebuilding.
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