If you want to learn, get a copy of electrical testing procedures and a copy of the latest electrical regs on site guide. Will cost you the equivalent of 2 hours labour if you were to get a spark in.
But, also fully understand, you do your own wiring at your own risk. Due to the nature of my earthing system (TT) I have 2 30mA rcds meaning any mistakes made wiring would have resulted in a nasty jolt... Start fiddling in your consumer unit without a mains isolator and you will probably kill yourself if you make a mistake, or worse, someone else.
It took me 6 months of reading up and working from minor jobs up before I was capable of the more challenging stuff, then I had to hire the test equipment to check it all. I only managed this as I wasnt living in the property at the time...
Even then, I paid for submain work and having the cu moved. 25mm swa is an absolute B@tch to work! I wasn't confident doing this so paid for the work to be done. I have subsequently added a few circuits (tut tut tut) and modified most others, at "own risk". I also made some changes to the system design (added a 100ma RCd to the annexe submain, the 30ma wouldn't have been able to discriminate against the 30ma in the annexe, so changed it for a 100ma one, plus a 60 amp fuse to protect the 16mm submain)
Don't be tempted to fiddle if you can't subsequently competently test your work.
Don't work live, no matter how competent you get (or feel!)
Don't cut costs on materials. Err on the side of caution, even if it costs a few more bob. Get yourself a decent multimeter, learn how to use it competently (including testing it before you use it to prove circuits are dead) and decent insulated screwdriver set. Get a decent voltage detector. One of those screwdrivers with ability in bulb doesn't cut it.
If it gets too much, admit defeat and get a professional in. Household mains wiring is not about giving it a go, closing the isolator and hoping it all works.
