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I would echo everyone else's comments that it is worth knocking nails down. I tried to cut a few corners and didn't bother knocking them all in and went through loads of sanding sheets as they ripped and exploded on me (first few were a bit of a shock as well!). Cost me a lot of money for the sheets at £8 a time and changing the sheets can take a while. I would recommend prepping as much as possible - it will save you timemoney in the long run
PS thanks though, some useful, if depressing, tips up there.