It won’t come on a plate, so you will have to work and study furthermore, to make it work, but it can be done.
This last line is very true...
Many forum members have moved into the world of mains electrical supply, design/installation/testing etc.
from other lower voltage electronics/communications backgrounds...
Yet even where the laws of physics and the various elements of the electronics & electrical supply worlds overlap... I'm not convinced that short courses can provide sufficient comprehensive knowledge to come out competent at the end of 6 weeks..?
And if you are starting with limited electrical knowledge and understanding, it is even more of a struggle to get up to speed and short courses no matter what they promises cannot bridge this gap.
As with so many products and services, a reasonable helping of common sense and reality is needed when looking at the various advertising claims, and what you will actually get for you money!
Which comes back to your last comment..... which is 100% true..
"you will have to work and study furthermore, to make it work, BUT IT CAN BE DONE."
So back to advice for the OP "Menomeno"..
you are young, you have made a start, but you are probably not quite as many rungs up the ladder as you think you are?
Try and find as many local electrical business as you can and do a bit of...
Door knocking/Telephone calls/e-mails/Snail-mail/Text-SMS/WhatsApp...
or any other communications methods you can think of...?
Try using the LABC competent persons search page, where you just stick in your postcode and "Electrics" as the trade..
https://labcfrontdoor.co.uk/find-a-competent-person
Then browse the list of local contractors to try and contact them...
Maybe ask if you could "shadow" one of their electricians for a week unpaid to aid your practical understanding and knowledge?
e.g. a bit like when school-kids do a weeks work-experience.
Don't know if that would work... but if you don't ask you never know!!?
I wish you well in your efforts to progress into the world of electrical work.