Nice, I got rewired (internally) my rare Lustere GST-801 tonearm today with Discovery Wire and Cardas male 5 pin DIN connector. My ex flatmate did the soldering nicely. 4 years ago he got started with technics sl1200mk2 rewiring for himself and then for most of our friends, now his skills are very very good.
I think for the first time you’d better ask someone (experienced) to do that for you and you can watch and learn, i’m sure then you can do it yourself.
My advice is to bypass the "motherboard" when you will have to soldering tonearm wires to the phono cable. There must be a motherboard, but just to fix the cables on it, the stripped ends of the cables should be directly soldered (tonearm wires directly to phono cable) without shite "motherboard" in between like a connector (avoid the "motherboard" if you don’t want signal degradation).
I think for the first time you’d better ask someone (experienced) to do that for you and you can watch and learn, i’m sure then you can do it yourself.
My advice is to bypass the "motherboard" when you will have to soldering tonearm wires to the phono cable. There must be a motherboard, but just to fix the cables on it, the stripped ends of the cables should be directly soldered (tonearm wires directly to phono cable) without shite "motherboard" in between like a connector (avoid the "motherboard" if you don’t want signal degradation).