I did mine in situ and it came out well. But would have been a lot easier had I removed it. Lucky most of the old paint had flaked off before I had started so the prep work wasn't too extensive. Factor in some time masking everything up if you don't want paint all over the rest of the engine bay.
I've a 20vt rocker cover and coil cover that I've cleaned up with a media blaster and im going to be powder coating in the next few days. I could be open to offers......