No, really, are they low or high mounts? Either way, pretty simple job. Just take your time. Mine were high mounts, which required spacers to shim out the rear sets. Still only took a couple hours. Are you changing the air filter as well? Sounds really cool suckin wind through an open filter.
The actual installation process only takes about 20mns (low mounts)
Do u have a jet kit installed?
If not you might wanna get it installed, if the bike has prolems starting or if you fell there's a lose of power when your ride.
To get the stock pipes off, you remove one bolt and yank it off. You could do one side in less than a minute if you have your allen wrenches and an 8mm wrench on hand.
Depending on the pipes, it can take longer to install the new ones. The Gia.Ca.Moto clipons that I used to use required a bunch of other adjustments to get them in place, so it took more like 20 minutes to install them properly. If you get a one-piece pipe that doesn't require any other adjustments, you should have it installed in just a few minutes.
If you just change the pipes, you shouldn't need to make any changes to the fuel injection.