Help With Noesis/Ripping in General

I want to rip sprites for a steam game called Starbound. It's an indie game similar to Terraria. I decided to try ripping for the first time, but, while some sprites could be ripped easily with a screenshot, some can't, so I want to use some kind of tool to do it. Is Noesis the best option? And if so, how do I use it?

The main problems are the spinny arms and liquids.