That is actually three questions. From what I have learned here, bad Saturn does not mean you are doomed for entire life, Saturn’s influence can be reduced, so yes, I believe you can do the working. Try to find the thread called “Obliterate your Saturn” that Lydia wrote last year, it might help you.
As to how to realize people’s sun sign by just looking at them...well, this is difficult. Yes, personality traits might be the most obvious marker, but I find that too dubious.
I have seen same behavior exhibited in many signs, for example.
This is just my two cents, and I hope that someone else will be able to tell you something more helpful than me.
Hail Satan! Forever!