having a new project is exciting!
Definitely read sheldon brown's website.
And get a cheap digital caliper.
The only thing I took to the shop when I was building mine was getting my fixed cup removed as well. My headset came with my frame, but if it hadn't I'ld consider getting it pressed in the shop too. If you find urself needing a tool that you will likely not use again, you should stop by the Time's Up bicycle co-op location in brooklyn. Google them, they have schedules for repair workshops where you can go in and use whatever tools they have. And there'll also be a mechanic on site in case you have questions. Good stuff.
And in addition to Sheldon Brown,
Park Tool's repair website also helped me out tremendously. Good luck!