I do all my own work. Get shop to install new upgrades but routine maintenance I do myself. That is what your bike has been lacking some TLC and routine maintenance. Do a total disassembly. Wheels all the way down to bearings, cables stripped from housings and either both or one replaced. Spokes are not the hard to do. Clean, degrease and regrease/oil all components. Buy a book if you have to. If doing your own mech work don't strike you as practical go to Walmart and buy a new Huffy every year.