I like TZFBird... You got friends/family/good friends.
Me personally.
If you want to learn a thing or two and offer a helping hand.. don't worry about payment.
I get to sit out and do it myself... depending on the job. don't worry about it or if you insist on paying. I say, Give me what you think it was worth.. the undercut it.
Family/Real close friends.. Don't charge a thing.


Sometimes you got to think. How much fun would it be? I charged my aunt a case of root beer and she watched my son while I did her intake gaskets.
Yet I did my moms brakes for free.
and I charged a friend I had known for 10 years and I charged him for the parts. he also helped me by getting tools/drinks things like that and I was in his heated garage.