I had been playing piano for a while when I decided to try trumpet, also.
I still remember the yard sale that mom bought it from. The mouthpiece cut my lip, and the bell was not attached. I convinced mom to buy a new mouthpiece, but that was it.
When I got to marching band, I was told that the banged up metal thing I had that tooted out notes needed to be fixed. So we got a few things done, and the only thing that kept me going was that I was a good musician, from piano. i could sight read, and was a good student.
I never played after school.
Fast forward 20 years, and my son is ready for band. I KNEW he needed a good instrument. We found a rent-to-own store, and they showed us an ok one. I asled if they had any more "in the back" and surprisingly, they had a beautiful trumpet, for a cheaper price! I paid right then and there, no renting, knowing it was a great deal.
Son has made All-State three years, and plays in three bands. With a wimpy and banged up pitiful instrument, he would have gotten his fine arts credit, and moved on to something else.
Not saying that the instrument made the musician, but, it certainly contributed.
And Yeah for a back-up! That will be a blessing!