I think it's almost impossible to fold it from an A4 so I cut the square from an A3 sheet. The belly and legs are still very hard, if you look closely you can see the paper is a bit crumpled in those regions.
Well, I started folding in 1988 but I learned only a dozen easy to intermediate models over a period of time of 4-5 years, then stopped. I resumed this hobby in 2006 and now I can fold more advanced models but I'm still learning.
I've been folding for as long as I can remember. Robert J. Lang's book, "The Complete Book of Origami (1988)" was the first I'd ever bought. Before then, I'd learned how to fold the traditional crane and lily. Of course, now I've advanced and started to fold more complex models.
I guess I'm the opposite. I enjoy folding the same thing over and over again, so modulars are one of my favorite things to fold. It is time consuming, though. What kind of modular models have you folded?