Howdy all, new/basically-not-yet 3d printer here.

I'm teaching myself Blender, and managed to make a low-poly bison figure I'm pleased with and thought it'd be fun to 3d print it. I'm wondering the best way to print this figure as far as supports go. My local library has a MakerBot Replicator+ I can print from, though a tech at the library does the actually printing (so I won't be at the machine making adjustments/fine tuning anything).

The makerbot software adds what looks to me like gobs of supports when I run the print preview, so i figured I could split the figure in half along the ~X axis, print two parts without supports, and join them later. I don't have any experience, but I'd like to develop good practices and habits from day 1 in the event I get around to doing more printing and/or getting my own printer. So I'm wondering if one direction is better, as far as post-print processing and final finish.

Are the 'breakaway' supports reliably 'breakaway'? ... or more like tediously cut and sand each 'breakaway' point?
Will my big split across the middle leave me warped planes that won't glue together nicely without a pass on the belt sander (which I do have, but seems like bad practice to rely on)?
Am I asking dumb questions or overthinking or underthinking?

The makerbot software estimates the full figure with supports at 6cm tall to take ~5.5 hrs with 2 shells and 10% infill (I clicked whatever infill pattern said fastest, diamond i think). At $1 per half hour to print, it isn't a bucket load, but I'd hate to try 2 or 3 times before I get it right. Advice appreciated, pics of design below.

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