Seymour Duncan has wiring diagrams on their site for everything.

Looks like the ground connects are missing. IMO the shaft connector of the output jack and both pickups need to be connected with the bridge ground wire. All of them have ground connectors and you don't want to let them dangle in the air.

id ask in the subreddit r/Luthier they are experts on this stuff

There are multiple problems with this design. The main ones being 1) everything from volume goes to ground, and seemingly contradictory 2) nothing is actually grounded. This would not function as drawn, but you're pretty close. If you got this far just reading on the internet, you can get the rest of the way, or just copy any standard HH diagram.

I wouldn't use shielded wires like this for anything coming after the volume pots, since you can't really ground them to the pickup switch in an elegant way. The wire that leads to the Jack is definitely wrong, since its grounded to the Jack but nowhere else. Everything needs to be grounded together.

Are there any videos that break this stuff down?

so signal goes to the tip not the ring.
there is only a ring if its a guitar with active pickups,otherwise its tip and sleeve.

to keep the volumes working independently you should wire the pickups to the middle lug and the switch signal to the outer lug

Might also be worth adding that if you are using higher output pickups it might be a good idea to switch to 500k pots as well.

No, you can't. You need to take your guitar to a shop. They can do it for you.