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Don’t know why you are getting downvoted, it’s absolutely true. Raw specs these days mean relatively little. With smart frequency boosts that vary with thermals, CPU and GPU on the same package, different workloads stressing different components differently, RAM bandwidth playing different roles for CPU and GPU applications, and many other factors, just stating that the M4 has so and so many cores is practically useless.
The only real way to gauge performance differences is via benchmarks and measuring sustained workloads.
Ime, not really. It feels daunting the first time, but the installation guide on the wiki is actually really good at holding your hand through it.
Just be careful not to skip any sections