There are posts on this thread about looking out of the window during rotation, and then transitioning to focus on the FD.
This doesn't work if a) it's foggy ; or b) if you're taking off over water, at night, with no external light sources for reference.
Boeing occasionally send test pilots to airlines who operate Boeings. They hand out Boeing pens and other goodies to crews, and also suggest the best methods they've found of operating the aircraft. These methods might occasionally conflict with the information in the Boeing FCTM.
The ones I've listened to recommend looking at the PFD at the rotate call, and if you have an engine failure, look at the (inertial) slip indicator.