How hard is a Cane Corso to work with?

Over the years my friends had 3 dog breeds, a Collie, a golden Labrador and a Beagle. Two of them died of old age and the one of cancer.

My friend wanted a challenge so her grandma got her a 4 week-old female Cane Corso puppy. She loves the puppy and is willing to put all the work. This is actually the first time she'll have a stronger, powerful breed. She's recently researching more about the breed.

Just to get an idea, how hard is a Cane Corso to work with? Her dog looks similar to this one:

How hard is a Cane Corso to work with?
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I have to say it's cute as a puppy but they have an imposing, scary appearances as adults.
How hard is a Cane Corso to work with?
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