I suggest you do it. Snapped timing belts and such can lead to much worse problems like bent valves. Baisc tune-up type things you can do yourself if you're mechanically inclined. If it's a stick, draining and filling the tranny shouldn't be too difficult, you can most likely do that yourself again if you're even slightly mechanically inclined. Things like tranny flushes (if you're car is an automatic), and coolant flushes, just take it somewhere you trust and have them do it.