Mid motor setup - step by step

[Chop chop]

Hi all

New to all this but learning more each day

Keen to switch my 210 rtr to mid motor before I join in with the local racing. Is there anywhere that gives a step by step guide of changing to mid motor for a newbie either with 3 or 4 gear. I appreciate you need additional parts for 4 gear (I believe)

Would be grateful if someone could point me in right direction as I have seen the configuration page but ideally after something step by step