After recording the acoustic guitar and vocals to a click track, I feel that the tempo is just a little on the slow side. Is there a way to increase the tempo of the entire project without raising the pitch, or do I need to start over from scratch? Thank you

Perfectly possible. First go to File -> Project settings -> tab: Project settings and make sure "Timebase for items/envelope/markers" is set to "Beats (position, length, rate)". (edit: I had wrongly written "Time" before, sorry.) Then simply double click the BPM field at the bottom and type in your new tempo and the items should be adjusted accordingly. (Note that timestretching, what happens here, can affect sound quality, but for small changes it's not that signifikant).

Change Tempo 

Yes it's possible. I would never do it but it's possible. I always rerecord... is that a word?

@nofish: It just needs to be increased about 3 - 5 bpm. I will try it out and hear how it sounds. Thank you. @donchilcott: :D Yes. I believe it is a word, but it is written re-record.

On the transport, R-click on the BPM box. Go to Playrate. Near the bottom of the popout window is the option to "preserve pitch". I think if you check that you should be good to go. But, as nofish said above, as much as 5 bpm's will make a sound quality change that is pretty noticeable. Kind of a warbling sound.... cliff