Removing Old Water Baseboard Heater and Controller?

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In the middle of rehabbing and need some advice.

The space has new water baseboard heaters, but the old ones were never removed. How difficult is it to remove (along with the old controller)?

I'm guessing since they were left in place it's more of a hassle to do so. If it is for someone with limited experience, any suggestions on how to make them look better would be greatly appreciated. 

Pics attached.