I favour taking profits as opposed to moving stop to break even as so many times i get stopped out at break even, so unless you hit a new trend the price goes back. It just never seems to work out for me by moving stops. However, if seems to work for me better in stock trading, where i would let the winners ride more.
NFP will make the mkts volatile. However i think the £, especially GBP/USD has bottomed now. So I may be looking for longs on the GBP/Jpy. But a clearer picture will emerge post-NFP.