Lets say we are editing this totally made up JSON file:

[{
  "id_4f7xg4egb": "<some_random_guid",
  // ... other fields
}, {
  "id_h34k3": "<another_id>",
  // ... different fields than prev object potentially
  "nested": {
    "id_j3h": "<nested_obj_id>",
    // ... nested obj fields
  }
},
// ...
]

It contains N objects (including the nested ones), and we'd like to replace the id value with the string coming appended to the field key itself. The result would be something like:

[{
  "id": "4f7xg4egb",
  // ... other fields
}, {
  "id": "h34k3",
  // ... different fields than prev object potentially
  "nested": {
    "id": "j3h",
    // ... nested obj fields
  }
},
// ...
]

Now, here is what I would do in VSCode using multiple cursors:

With VSCodeCtrl+d

• Select first occurrence of "id_ with Shift+→x4
• Select (and create a cursor on) every occurrence of the remaining N-1 "id_ with Ctrl+dx(N-1)
• Select the id string(s) following "id_ with →,← (to deselect), Ctrl+Shift+→
• Cut them with Ctrl+x (yes, each cursor gets its own "clipboard")
• Delete the _ with Backspace
• Select the portion we want to replace ( "<every_diff_id>" ) with →x4,Shift+End, ←x2
• Replace the value with Ctrl+v and Esc to get rid of the extra cursors

So we are talking about 5+N+5+2+1+8+3=**N+24=o(N)**keystrokes (taking into account the fact that, for example, the Ctrl key is counted only once and then held down for the rest of the N-1 Ctrl+d commands).

With the Power of Vim

And... my question is:**How to accomplish the same result using Vim (in =< # of operations, ofc)?!**I'm a noob, one week old vimmer, and I'm loving it so far! I've been using . and basic macros for similar tasks, but I'm not sure what would be the most efficient way to tackle this one :(. I'd also prefer a solution NOT using plugins or involving adding some complicated mappings/functions to my .vimrc. After all, the VSCode solution is vanilla VSCode ;).
Thanks!