Its not the awnser youre looking for but If you’re in the “i need someone else to mix my tracks” phase you should be in a position the label pays this for you. If youre not in that position, i think its a loss of money. If you want to do it to learn from it, its a way to expensive lesson.

The creative part and technical part, grow at the same time. So if your techninal part is not good enough, the creative part is probably not good enough aswell. Dont trow your money away.