152 has a bit less elevator authority than a 150, so harder to get it to spin. I once wrote up a 150 for not getting into a spin easily. Mx came out and fixed it, told me later that it was a good writeup as the cable had too much slack in it!
As for training, when I was a CFI, I never once soloed a student without spin training, and never lost any students due to being scared off. It's all in your attitude.
Not to be taken lightly when teaching them, I always included a full brief with aerodynamic explanation, did a wt and balance to ensure we were loaded in the envelope, climbed to a safe altitude and location, properly cleared the area. The one thing I did that was different than many was that I had the students enter and recover on a sectional line (road, etc) after a specified number of turns. That seemed to occupy so much concentration they didn't have time to be scared!