How to successfully invest despite dyscalculia?

Let's say you are overwhelmed by investing world (so many instruments to choose from, each taxed in a slightly different way, each with different risks), while numbers don't make much sense to you (percentages, FX rates, etc.). You tried investing in the past, made a ton of mistakes you didn't really feel you learned much from, so you don't trust yourself with money anymore. How do you keep your savings away from inflation?