Are there any rules/pointers on the actions involved in equipping/readying a shield?
The "Readying Weapons" rules on p.105 talk about two items per turn as a free action.
But what about shields?
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The core book seems rather terse on the shield rules, which is to be expected from a game that advertises itself as streamlined. That being said, there are certain logical considerations that can be used to get an idea whether the action would be relatively fast or slow.
The key is the question: which type of shield are you using, and do you want to distinguish them? The terminology can be slippery and inconsistent between times and regions, so I'll explain the possibilities in plain words.
If you don't want to over-complicate things, I suggest just treating shields as a regular weapon (the first option), and glossing over the question of straps for the shoulder-supported shields.
1 I say a 'normal' weapon because a realistic technique of wielding a shield absolutely does treat it as a weapon in all ways that matter: keeping it mobile, using it for the occasional bash or to influence the enemy weapon, making defensive feints etc.; don't mistake the Hollywoodian image of a shield as an easily outmanoeuvred stationary wall for the real thing (it comes from an overly literal interpretation of shield wall tactics applied to one-on-one fights).