I’ve completed all my panel wiring without a hassle - I am not a dummy, have done a bit of house wiring without getting too many shocks or blowing fuses- but I have never attempted to do anything like this before. I first bought Jon Croke's video on wiring aircraft, it covers the basics and gave me the confidence to draw up a rough wiring plan which my son who is an electrical engineer (in Canada) put through his computer and provided me with professional schematic plan(s) (and way easier to follow than the rotax manual plan for engine only!) - he also cross checked the wire / fuse sizes which I had initially predetermined after reading the manufacturer's instruction for all components (and with the knowledge gained from the video). Every wire was labelled in the plans and I listed each one with its fittings on a speadsheet from which I could order everything I needed in one hit from aircraft spruce.

To make it easier, I bought fully made-up wiring harnesses for the radio and transponder.

From there it has been plain sailing and everything tested so far has worked first time, as it should, (no smoke, sparks or bangs!)

If you watch Jon Crokes video and still feel a dummy - then maybe you will need to talk to an electrician - it will be too painful to walk you through it in full detail by email! Do your homework. I haven't seen the recommended book, but if necessary get that too. You need to understand, not just follow instructions. It will be easier for people to help you then.