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Congrats on getting a good deal~! It took me a few years to get used to, only because I was so deep into SAI that I didn't want to change. I think I've been using SAI for around 7-ish years. I now use CSP for all my comic work, but SAI for all my other digital art. I have my custom brushes set up and I'm not weirded out by the way CSP functions, so it's been smooth sailing! I like it a lot more than Photoshop, which I barely touch anymore (except for effects), and it's now safely tied with SAI as my favorite program to work with.

CLIP STUDIO PAINT EX is the world's leading comic and manga creation software and delivers powerful art tools for every manga and comic artist. It is designed both for artists wishing to enhance and perfect their pen and paper illustrations and for artists wishing to complete the entire process of creating manga and comics digitally.

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I've been using it since 2014. I don't remember how long it took to learn it, but it wasn't so incredibly different from Photoshop, so it wasn't hard. Some of my favorite features are the brush engine, the 'close gap' feature of the magic wand select-y thingy, the built-in screentones (though I don't use tone anymore), and the lightweighted-ness of the program.
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I was just going to suggest the Runtime DNA forums as an awesome resource for tutorials and questions, but in trying to look up the link I discover it gone. Well, if you get stuck, just go for Google, or ask here! I haven't switched over to it fully, since I don't want to delay my schedule by learning a new program. I'm planning to do my next chapter in it however. Some of the features are really useful, the perspective tools etc, and some you think would be useful aren't fully formed enough to be that useful. For example, the 3D mannequins are incredibly fiddly to use and not customisable (especially when compared to Poser or premium 3D packages like Autodesk Maya (though maybe that's an unfair comparison)). The panelling is very useful though, since in Photoshop I do this with a tonne of masks and it's a pain sometimes.