I have some photos that answer tough spots if a problem occurs, but do not know a picture tutorial. It could also leave gaps, leaving you asking how it got there.
So, I had an idea: https://www.youtube.com/watch?v=GWc6i506oEQ <<< If you watch this video (which is better than most) on your phone... you can pause and take screen shots at points you want to keep. Yet you could watch how it got there. You could even take screen shots every few seconds.
As a back up to that plan we would be available here to help with tough spots.
I also think that @AdioSS knows of a pictorial on Beretta Forum that he could link us to. I'll send him a message.