It can be a bit tricky. I would look for a web site that publishes the frame geometry so that you can compare the differences and how the size is measured.
You can't adjust standover, so if the frame's too tall, you're out of luck. But if you can stand over the 60 then you can obviously stand over the 58.
I'd agree with others who say the top tube is an important measurement. If it's too long, you will be straining to reach the handlebars (too short and you'll be cramped up). You can correct this to a degree with a shorter/longer stem, and most top tube increments are only 2 cm. But a test ride would really be the best.