Here’s a post I wrote up about my Spanish journey that touches on some of this! It was in response to some advice shared about studying two languages at once.
It definitely can be hard, and you will of course have to make some sacrifices (time spent on one language is time not spent on the other, basically), but Spanish is just so important for my job, I really should be trying to work on it at least a little. The good news is that my Spanish is good enough that I can practice it by immersing without really having to do dedicated vocab/grammar study (which can get tiring). Because reading in Spanish is so much easier for me than reading in Japanese, that also really helps motivate me.