After having as detailed a look as possible at these types of weapons, we can draw out a template of the things you will need to cover in using these types of weapons - there is indeed some crossover with flail types.
- Most importantly, you will need to be able to cast the chain to strike a target.
- You will also need to be able to flail hit a target with the uncast weight.
- You will need to deal with a situation where you miss the target and/or hit the ground, and are attacked before being able to recover the weight (which would also suggest you need to be able to recover the weight after missing if possible).
- You will need to deal with a situation where the opponent entangles the chain, probably with their own weapon and then attacks you.
- You will need to defend yourself at close quarters using the sickle, including grappling at close distance.
Probably not all that many surprises, indeed perhaps you could have sat down and worked these things out yourself once you understand the weapon.