would you do this? valve seal repair...

[duckseatfree]

So I've had bad valve seals for about 4 or 5 months now and have found someone that can do the valve seal (and maybe the guides too) repair for $45/hr if I buy all the parts. He estimated that total it would only be about $600 and he could have the car for me the next day. That definetly beats the $8,000 from the dealership and $4,000 from an indi shop. So I had a few questions for you.

1) The guy works at a Subaru dealership as their mechanic - has all the certifications. He's done the same repair before but not on a BMW. Would the job be pretty much the same? He said that aside from a few things here and there it would be.

2) Where can I get the parts for the repair?

3) What parts would I need for the valve seals...and the guides.
- I can't remember if he said he would take the heads off or leave them in so I'm giving him a call later this week to figure that out.