The more info you can get before taking it apart, the better. The problem is that some parts can go in more than one way, and fit, but still not work. For what it's worth, the Piettas are slightly different from the Ubertis. Pics definitely help. I ended up using the original patent design in A HISTORY OF THE COLT REVOLVER by Haven & Belden.
I must have said a hundred times when trying to get it all back together the first time, "I can see why Sam went bankrupt with this gun."