I had a coil go bad in my 2007 5.3l edge and the mechanic quoted me 815.00 to change plugs and coils..I bought oem coils plugs and gaskets from a company in Tennessee for 200.00
I am a 33yr old woman..I changed all of them completely by myself in under 2hrs..I didn't have to replace any tubes..
Believe me if you have a 8mm socket it's definitely worth doing yourself and saving the money