Absolutely! I spent a short time as a mechanic (having gone to school for it but never used it) and it does save a lot of money. Shop labor rates are usually between $89 and 129/hour. That's a LOT of money especially when some of the jobs are frankly pretty darn easy. I did plugs, fuel filter, and cleaned the MAF on my wife's 4Runner not too long ago. Probably would have been $4-600 labor plus parts at a shop. It cost me around $50 in parts and about 2 hours total. I figure I paid myself at least $200/hour for the work.