To add to the above (most of which I wasn't aware of, so thanks): start out with TinkerCAD + PrusaSlicers. TinkerCAD is super easy to get started, but does allow for fairly precise building blocks. PrusaSlicer has a bit of a learning curve, but once you know there's almost nothing you need to change other than level of detail (nozzle setting) you should get pretty far on your own. I learned a bunch of printing wisdom from /r/fixmyprint, one wisdom of which is that given a seemingly simple problem there are always four different solutions proposed cuz overstimating internet users. But the good one is usually in there. With infrequent use of the printer, there's a good chance the nozzle will clog and your printer will not print a single good layer. There's a few YouTube videos on how to solve that, it looks hard but it's not that hard once you're comfortable opening up your printer head.
Messing around with TinkerCAD today and likely through the weekend as I get started. Thanks for the rec. Dipping my toes into electronics/soldering for the flight controls itself is the least interesting part of the long-term goal, mostly due to ignorance. This'll help alleviate some of it. r/fixmyprint seems a goldmine. Funny (and encouraging) seeing a few of y'all able to chime in on 3D-printing. Wasn't expecting it, but all-the-more excited for the gadget to arrive.
Any dipshit can learn to solder in 45 minutes. Any dipshit who knows how to solder can learn to do surface mount in 2 hours. Sincerely, some dipshit who has gone through four entire rolls of solder