j_davey,
unless you are at either end of the envelope to begin with, you'll be fine. Too far aft and you could be looking at overrotating the flare and having a tail strike. Too far fwd, and you could end up running out of energy too soon in the flare and wheelbarrowing it in.
I have a feeling this is not news to you, but perhaps it will be to others reading this thread.
Rgds,
/Fred