There are a number of operations where it's more economical to have your LBS do the work than to buy the specialized tools necessary to do it yourself. In this vein, I would recommend having your LBS:

- Face and chase the bottom bracket if needed. Most manufacturers do this at the factory, but if you buy a custom frame or a super, super-cheap frame it may be necessary.

- Reaming the seatpost if necessary. Again, most manufacturers will do this at the factory.

- Cutting the fork to length, installing the crown race, and pressing headset cups into the frame (if required). The tools for this stuff aren't that expensive, but if you're not planning to build lots of bikes they're a waste of money. My LBS will do all of this for $20 or $25, IIRC.