I did it myself and if you fell pretty confident it's pretty simple. Just make you go slow and drill the holes in the right spot.
I wouldn't take it to a local guy unless he did it before. I tired that before I did it myself and I spent more time explaining what it was for and why I wanted it done than I expected.
I'll see if I can find any pictures tomorrow, but really the only hard part is clearing a spot for the bushing to fit into. They have to sit flush in the frame so there is a spot for the guide rod to sit