Sounds daft, but keeping your workspace clean - especially when you sand, file and trim a lot - is quite essential. I spent a lot of time brushing away little bits and dust from my cutting mat - it really started to be a pain. But I've just bought a very cheap little tool that has solved this problem...
This little USB powered vacuum cleaner was just £1 from Poundland...And it works!
It collects all the dust and bits inside the front half of the gizmo - which detaches so you can empty it - and has a turbo overdrive button for stubborn bits.
I power it from my laptop, which I keep next to my worktray. It really is a no brainer purchase!