Yes and No.
With the right tools, care, time, and effort, anything can be a do-it-yourself job. However, you must ask yourself, is the money I might save worth that time, effort, and care?
Granite is heaver, requires expensive tools, and can be broken with improper care. If that happens, you’ll really have a problem.
Additionally, you might find getting it right could prove difficult. By the time you’re done with the job, you may find it’s easier to just leave it to the pros.

I just had granite put in my kitchen but they broke the large island piece in two places and tried to glue it back together. The cracks are better but still noticeable I am afraid it might break again…am I worrying needlessly? I think they need to redo the whole job but I don’t want to be unreasonable. What would be a fair percentage off the price to settle? I owe 50% of the bill. Thanks