A couple things I noticed when framing this...
A) It's wood...it's seldom straight and not always the same dimension and thickness as the one beside it in the stack.
B) Use string lines from known points and leave those lines up that they can be checked periodically as your building.
C) Don't let someone talk you into loading the roof with the roof sheathing prior to having the fascia boards on. In the end it's easier to haul it up a ladder than deal with the point loads on the truss's.
D) It's not any harder to overbuild things rather than cut corners although it does cost a little more.
E) NEVER trust that anything is straight without checking and confirming it.
Lines and lasers are your friends...
Enclosed is a few pics of ways I found to correct some issues I ran into as I was building this.
I do need to give a shout out to my Dad and brother for the help and knowledge that has been shared.
For now I'm dried in...
Well... the roof anyway...