Do it yourself; there's nothing to it, even a "caveman can do it"!
- replace fuel filter
- replace air filter
- replace spark plugs
- replace plug wires, distributor cap/rotor if motor has more then 100,000 mi.
- check ignition timing
If you decide to have someone else to do your tuneup, be very careful who does it. Some these grease monkeys can very easily screw things up.