I've got my nails back to a reasonable state after too much gardening and DIY but they are now stained after doing a lot of blackberry picking. I have one of the white nail pencils but not completely sure what I should be doing with it 
Do I colour in both the underside and top of my nail? Varnish before or after? I am asking this as I have just tried to do a French manicure and now look like I have dipped my nails in Tippex. Although they look better than the manky stains from the blackberries. Any tips?