I've put together Sackboy's arms and hands now. Luckily they weren't as complex as I was dreading and thanks to the lovely instructions that the lady made it was super easy to follow. The only real complex part of it was doing the left hand as I had to make it the same way as the right but kind of backwards.
This means his left hand isn't as cool, but I'm sure it'll all look cute when he's stuffed and finished.
If you look closely you can see that the fingers in fact look really creepy.