If Century or IO can do it so can you. I'm sure you can screw it up if you go too fast. Some of the videos I saw looked like crap. I would measure (twice) and mark the opening as I want it then stop before I get there and go real slow, check fit, file, check fit, and so on untill it's just right. Get reference pics of a factory double stack to help out, or if you have another ak measure all the pertinent areas.

Is it worth it? Only for you to judge. I'm sure a competent gunsmith could do it for a reasonable fee as well.