First off, you will crash. That is part of the hobby and it is to be expected. So don't tear yourself up when that happens. Besides, repairing crash damage can be as much or more interesting then building the plane in the first place. I never built a tiny trainer, but I have had good luck with the Storch. Before you buy your first plane though, I would recommend you buy a flight simulator. Preferably one that you can use your radio with. Life is easier with a reset button and you can learn a lot about basic flight and more advanced stuff that way.
Maybe consider buying a plane like the Sport Cub S with AS3X. ( Horizon Hobby) Planes like that have gyro's in them which with the flick of a switch can go from total novice to regular pilot mode. They even have a chicken switch which will cause the plane to fly straight and level regardless of what kind of trouble you get into. The Sport Cub S is a very light plane and will not handle winds well, but it is a great starter. By the way, at least for Spectrum compatible stuff, you can buy receivers with gyro's in them. For instance... https://www.motionrc.com/collection...mx-compatible-receiver-with-6-axis-stabilizer . I use these in a couple planes and they work great. Have fun with the hobby and good luck!
Tiny trainers are pretty accepting of most batteries. Just need to be creative with where you put it for cg reasons.
When you said you ordered the reccomended motor, did you order the flite test power pack they reccomended or what? Power packs are great because you know it will work. But if you have the same motor at least, you can probably get the cg right with other electronics with help.
Good luck! Your in for a treat!
I have the TT with a BR2205 2300kv with 6x3 and 2S 800mah
and The Fish with a CF2822 1200kv 9x4.7 slow fly and 3S of 800mah and some homemade batteries 3S 1500mah
I always start the day with the Fish and when I warm up I pass to the TT
If you're running into walls with SAFE on, I'd recommend some sim time first and foremost. The easiest way to wreck a trainer is by turning towards yourself and not having the instinct to reverse your control inputs. This is totally unintuitive and only buddy boxing or sim flying can get you ready for it. I would recommend sim as you can put in as many hours as you want.
This skill can even be learned on such free and basic simulators as CRRCSim or Picasim. Honestly, Picasim is a pretty good sim either on mobile or on PC, and on your phone can be pulled out in a moment of boredom to crash some planes.
Question: Do some ESC's power the receiver?