Depends on how you feel about your mechanical skills. It's definitely a job. At least you won't have to re-wrap drop handlebars. 
Cable housings need to be long enough that they won't restrict your bars from turning, or inadvertently apply the brakes or shift at steering lock. But they need to be short enough that the cables won't hang up inside them.
Measure twice, cut once. The best way I know to cut the housings, is to score all the way through the outer plastic with a razor blade, then bend the housing so you can cut through the inner wound wire part without crushing it. Then use a file to take any burrs off the cut edge. Any barrel adjusters, ferrules, etc., you'll usually need to re-use unless you specifically need and buy new ones.
The cables themselves I don't usually cut until after I've installed them.
Make sure you get cable ends from the LBS, I can't tell you how many times I've bought cables and had both myself and the LBS forget end caps.
You'll want a real crimping tool for those, too, pliers are just too wide and it won't grab the cable if you use pliers; but if you have a cheap electrical kit in your toolbox, there's almost surely a crimping tool in it that is good enough for cable ends.
Or you could spring for a real bicycle or motorcycle specific housing cutter with a crimper... $$$
Deb, what am I missing?
Speed comes from what you put behind you. - Judi Ketteler