Step 1: O?
No, it's one of the reacting ions.
Step 3: Ag - e --> Ag+
Yes, but you need to add a charge to the "e"
so it's Ag - e
- --> Ag
+or
Ag --> Ag
+ + e
-Both are acceptable.
Step 4: I don't really understand what's going on here...
Ok, where does the oxygen go in
NO
3- + H
+ + e
- -------> NO + Something <- I have not balanced this for you
What is "something"? It must have oxygen and hydrogen in it right?
Now balance the equation.