The video is good for sorting out the cable connections.
The 'Kit Box' to put the relay, delay, timer in MUST be at least L100xW80xD55, I received no instruction with the electronics, but you can Google the number on the unit and download the PDF instruction. Having said that the video does explain most of it, especially Mode 5.
There is a method of increasing the fractions of a second from 0.0 to 0.00, I messed it up once and it took a while to get it back to 0.0, but I was drinking a can of beer at the time.
I used a table light switched to 'on' to plug in to the circuit when testing. My face must've been a picture the first time it worked.
I have seen cable ties used inside the Kit Box to stop the cable pulling out accidently. I cut up an old anti-scratch collar, (the dogs, not mine) and folded it over and cut holes in to restrain the clips, (there are normally posts inside to put self-tappers in).
I used an old laptop power supply, it will probably be easier to cut off the balancing unit near the plug and add one later so you have enough free cable to get inside the Kit Box.
There was a guy on one of the Forums who had a lifetime of experience with heat treatment. Alantoo, his post is near the bottom of the page.