The trickiest part on a LOC BC is to remember to read the approach plate and set the FRONT COURSE. Jepp tells you what to set. If you set this in your HSI you'll have no problems. Also select BC then LOC on the MCP, with out refrencing the book, I believe on boeings the order of selection is important.
Anyway, just keep the airplane symbol on the magenta line if you have negligble map shift or GPS. Fly it VNAV if you can.