Its not really power stuff; its literally jamming metal into your Switch. You're making it a lot more complicated than it needs to be. The only trouble you could potentially run into is shorting pin 4 which can mess up the voltage of your Switch but its nowhere near the pins you connect pin 10 to short it out which include pins 1, 7, and 9. Most jigs and paperclips connect pins 1 and 10 together to ground 10 while aluminum foil is used to join pins 9 & 10. You can even take a cable to connect pin 10 to the metallic screws on the rail or the fan grill on the top.
Potentially.
Is they're a video tutorial on how to mod the switch you can reccomend? i'm always nervous about looking up youtube videos because a lot of the time the info is outdated or something, and I have a hard time reading instructions as opposed to watching a video where I can actually see what's happening.