I've been using FCP for a number of years, and am stuck on FCP7 due to lack of time in investing in learning the new version. So...I use Plural Eyes to handle a lot of the syncing. Another note, if you shoot a video screen, or from a great distance, the audio will of course be out of sync. how much delay would you need?
The sound lag/delay is approximately 1ms/ft. In the back row of the 200 level in an arena that comes out to 4-6 frames (at 30fps) depending on how stage is set up, catwalks etc.
I typically correct for delay in both stage shots and screen (often they will have different lags).
I started with iMovie then moved to FCE. For the past several years I've been using FCPX. Both transitions (from iMovie to FCE, then onto FCPX) were difficult for me. After failing with printed books and online tutorials, both times I had to resort to taking One-On-One sessions at my local Apple Store. After a few sessions of each though I was up and running.
I love FCPX now. The audio/video sync feature alone has saved me countless hours of time.