I got a new (second-hand) bike this week. It’s got swept back handlebars and I just don’t like them after riding with them for a few days. It feels like I’m holding onto a zimmer frame and I hate how I have to hold my arms to the sides 
I wanna replace em with cool, non-lame handlebars like these 
l will almost certainly need longer cables for my brakes and shifters though. How much of a pain in the ass would swapping out the cables be?
not hard at all. you’ll probably want some zip ties, and some real good wire clippers. you dont want the cable to fray, especially on brakes.
just pick up new cables and housing, and you should be good to go