It really isn't that tough, though I've never worked on an M&P. All of my Glocks get it except my CCW (too rough, tears up clothes). If you have any AR accessory parts, that's a great place to start. I did my AFG2s first to get the feel down, and then moved to my Glocks. I love the grippiness. One caveat, be mindful of what tip you use. The size of the point is important: finer point is less aggressive, larger point (melts/displaces more plastic) will be more aggressive. I use a very fine point on my saudering iron so as not to over do it.