Bathtub install - handyman vs plumber

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Hey everyone,

I'm in the middle of renovating a bathroom in a rental unit and am having a hard time deciding whether to hire a plumber for installing the new bathtub.  I currently have a contractor re-doing the tub along with wall tiling, and he is good but unlicensed.  A plumber that came out quoted me $3k for installing the tub alone, which is close to what the contractor is charging me for everything.  Would you feel comfortable relying on a good contractor or handyman to install a tub or do you always go to the professionals?  The unit is 1 story, concrete slab foundation.  Pictures attached.  Looks like some of the wood around the tub might need replacement or reinforcement but am not sure.

Thanks