I am a master certified ase mechanic,and a master certified emergency vehicle technician,and have been for 18 years.All i am saying is if you are not capable of fixing something don't.
Check into the machanic you choose to use,I have had many people even ask for references.Allways keep the old part so you can show the consumer what was replaced and why,then take it back for your core deposit return.It goes a long way in customer relations,and makes it easier for the customer to understand.
But like i said,a shop and tools don't make a mechanic.I have had to fire 2 very certified ase mechanics because they were completely incapable.