Is it necessary to hide the bones of IK and FK to different layers before working on right hand while preping IK/FK rig for arms?

For those like me, who do not know much about blender, and we have updated to 3.0, with the driver editor, you can follow the tutorial very well

If anyone is seeing this video in 2020, for the driver, instead of copy path etc, you can "Copy as New driver" , go to the driven property and then you right click and "Paste Driver"

Hi, thanks for the tutorial! Can someone help me how to snap bones like in the tutorial at 17:38?