Bringing it to someone familiar with transmissions is a good idea.

I'm sure some could sucessfully clean a valve body and reassemble it, but certain things to inspect might be overlooked. Its not only the fluid paths that need to be cleaned, but check balls should be inspected, valves and springs should be checked, solenoids should be tested, accumulators should be checked and rings replaced, and other sensors/plugs checked.

A refurbished valve body job should run anyone upwards of around $400 including parts and labor, assuming you pulled it from the transmission yourself and will do the reinstall and refill of fluid.