Except that if they haven't been replaced before, the screws may be hard to get out without breaking them because they're probably rusted out. ALso, its easy to get a mouthful of gas if you're not careful about clamping the lines.

I can't find the time estimate for the pump and accumulator, but alldatadiy.com gives 1.1 hrs for the filter (.8 for warranty work), and replacing the pump and accumulator at the same time shouldnt' add more than another hour. Problem is that an unscrupulous mechanic may try to charge you 1. 1 hrs or more for each component, even though he only has to do most of the necessary things once. So, 2 hrs seems reasonable, and 1.5 even better. Then again, some guys will try to pad their bill with exhorbitant part prices. So you may want to check those out before you commit to anything