I've put up 2 decks... They're a pain to do from scratch/design yourself.
No real helpful hints unless you really don't know much abut woodworking.
Digging of the posts for us was the easiest part (even with this Western PA dirt, which is filled with Shale and Coal). We had the proper tools to start that though, and cement them into place....
Wear some sunblock, but get a nice bronze... That's my advice while you're out there.
And mind your patience because if you're like me you'll wind up doing it by yourself if you don't control your temper.