Don’t skip the dialogue, even if you use subtitles and are a fast reader. It sometimes switches from one sentence at a time to whole chunks of dialogue and action getting skipped. Plus, the voice acting is superb, and the physical reactions of characters can convey a lot of emotion.

Apart from White Orchard, you shouldn’t need to complete all side quests in your area before moving on. Particularly with witcher gear, it’s sometimes expected to need to come back at a later time when you’re more powerful.

Others may disagree, but I don’t bother dismantling gear and weapons. I find it simpler to just sell things and buy materials I need from vendors.