How hard is it to fix crumbling plaster myself?

I have a 10’ diameter, spillover spa made of gunite and plaster. A big chunk of plaster fell off the pool last winter it was impossible to hire a reputable pool plasterer. I ended up finding someone on Craigslist and he did an awful job. Cosmetically it was ugly but I was willing to live with it as a temporary fix until I could find a good refinisher. Then the patch that he applied fell off during the pool season. So I'm back to square one.

I’m thinking of fixing this myself by...

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