Hi,
There was a simillar thread to this the other day started by gemma t if you go down the page and maybe a few back you'll find it.
Everyones different and it's finding what helps you best i use a boomerang file (can't remeber what grit off the top of my head but 240 i think) i use the harsher side down the side walls and across the top of the tip a few times till the majority of it has blended then i go over it with the smoother side of the file a couple of times then use an orange sponge board to finnish it off!