If I were there, I would do it in just a couple of minutes with a new $5 plug from Home Despot. If it is right near the end then you just need a new plug and you’ll only lose a little cord. I did one earlier this week and it is only an inch shorter than it was
If you know how to use a screwdriver then you are halfway competent at repairing it, and if you can use a pair of wire-cutters then you are almost there. It really is not wort taking to a shop. All you need to do is cut the end off right near the plug, strip away about an inch of the outer insulation and about ¼” off of each of the three wires inside.
The black wire goes to the narrow blade or slot (depending on whether you are doing a male or female), the white wire to the wider one, and the green or bare wire to the grounding plug (the small round one at the bottom; not present on some cords).
If you are still antsy about doing it yourself, then just walk into nearly any electrician ‘s shop with it and they might do it for you in three seconds and possibly not charge you for the labor since it is such a trivial task.