These origami models are high intermediate models. They start from the frog base. The folding of the frog base is also explained in the diagram, but different than the instructions you usually find on the internet. The folding processes of the hermit crabs resemble very much. Before you, lies now the choice which hermit crab to fold.
You could fold the hermit crab with the standing shell.
Or you could fold the hermit crab with the lying shell.
Folding this model, you need to cheat a little bit. You need to strategically cut the slit in step 48. By doing this, you can make two outside reverse folds you could not do otherwise. The folding magic in this model lies in step 22, where the paper flips.