Hi Evan. Large, complex deployments are one of the trickier things to get right.
The interlinking dependencies between items and some quirks of the metadata API mean that, in general, the smaller you can make each deployment the higher the chance it goes smoothly. We have a support document which gives some guidance on splitting up a deployment into stages - https://docs.gearset.com/en/articles/2117699-splitting-a-complex-deployment-into-stages - but as everyone's scenario varies it's hard to give specific advice without more information.
If you're hitting up against lots of validation errors, a good bet is to try and focus on the errors that relate to invalid components or "true" errors first. Errors relating to missing components can often be a consequence of the original item not deploying and fixing those can be a bit of a red herring.
Hope that helps a little, and of course if you get stuck feel free to contact our team via the in-app chat.
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