I don't think there's anything inherently wrong with light modding (intake, exhaust, brakes, oil coolers, suspension stuff, etc) but you need to know what you're getting into and it's 1000x better if you do it yourself. As others have said you'll save a lot of money and also know it was done right.
Heavy modding like FI applications is best left to the pros.
As for tunes, know your shop is all I can say.
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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)
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