I have a Gary Fischer Marlin with a back rack that I ride to do errands and run the dog. I already changed the tires. It fits ok but I want a more upright position. I am thinking of changing the handlebars to a 3" rise (currently flat bar). I also want to add fenders and a kickstand. I think that's the majority of what I need. I did see a brooks saddle on craigslist that needs rescuing!

I know my cables are too short. I've never changed cables. Am I better off having my LBS do the change or should I full steam ahead? What else should I think about?