Modern Cylinder Head

Totally different ball game approaches here.

If you know what your doing, then you do it yourself and probably get it done really cheap.

Then there is a thing of, IF you have room to do such work. Even if one did have the room, gathering and learning the proper equipment to learn from cam be an expense one may not wish to spend on.

If you don’t know what your doing, you pay someone.
If your paying someone, seeking out the best reputations in the biz is what I’d call money well spent.