Struggling to find the right spot for clitics in complex sentences

I'm a grammar-focused learner, and I’m having a nightmare with clitic placement in Galician compared to Spanish. Does anyone have a clear guide on 'enclitic' vs 'proclitic' rules when using compound tenses? I’ve been trying to explain these structures to my AI tutor on Chickytutor.com to get some corrective feedback, but I feel like I'm missing a core rule about when the verb forces the position.