I'm currently a software developer with around 5 years of experience, but have never had a major hand in architecting new systems. All my prior experience has been just working within existing systems. My current position is giving me the opportunity to have a larger hand in architecture, but I feel a bit overwhelmed trying to understand how to create systems just from general product design documents.

How did you learn to build this skill. Do you have an concrete resources to ready/study for building this skill faster than just the normal try/fail/repeat loop?