Does staple removal hurt? How is it done ?

Most neck lifts have a very small scar and it's not usual to have 25 staples but it seems like your scar might be bigger, and maybe you have had a larger direct neck lift.
Most plastic surgeons do not use staples in a neck lift but they're easy to remove if used. The procedure is typically very straightforward and a specific device called a staple remover is used. For facial procedures, there are special smaller staplers that are different than the larger ones used throughout the body for different surgeries. Most surgeons do not freeze for anesthesia but using a topical numbing cream is a good idea if you're nervous.
I would recommend that you see a board-certified plastic surgeon in your area that is a member of both ASPS & ASAPS and performs a lot of facelifts & neck lifts if you have any issues.
I hope this helps. If it does, please take a moment to up vote this answer on the “respond” button on the top right.  Hope the removal is quick and painless.

Staple removal after a neck lift is not a big deal.  It will cause minimal pain and discomfort.  I do not believe you  will need numbing and it will be quick.  I would not worry about the pain with having staples removed.I hope this helps.