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A small heads up - it might be advantageous to leave the thresholds off until the boards have been finished as it will make sanding the edges a lot easier. Sanding right up to an edge is quite tricky, so having the gap exposed is actually a good thing. I've seen a lot of people doing the whole floor process before putting skirting back on too.
There's a whole rabbit hole of this guy's videos but he definitely knows his stuff
https://youtu.be/MUpRHhxr-2g
Quality! Good effort getting stuck in.